Sbírka 34+ Atom Nucleus Diagram Zdarma

Sbírka 34+ Atom Nucleus Diagram Zdarma. The nucleus is very small compared to the size of atom and the entire mass of an atom is centered in the nucleus. The binding energy of a nucleus is the energy holding a nucleus together. Atom nucleus the nucleus is the center of mass (a), but does not significantly contribute to volume.

Nejchladnější What Is A Metal 2 Arrangement Of Atoms In Metals Openlearn Open University S111 P1

Nucleus occupies an extremely small volume inside the atom. The nucleus concentrates most of the atom's mass. Nov 24, 2020 · the nucleus (plural, nuclei) is defined as the dense, central part of an atom, consisting of two subatomic particles, namely protons and neutrons.

An atom is composed of two regions:

The nucleus is very small compared to the size of atom and the entire mass of an atom is centered in the nucleus. It is made up of: Jan 15, 2013 · the atomic nucleus is the small central part of the atom, with a positive electric charge. The nuclei of some atoms are spherical, while others are stretched or flattened into deformed shapes. The nucleus is very small compared to the size of atom and the entire mass of an atom is centered in the nucleus. The following diagram summarizes the basic facts of the structure of the atom.

Nov 24, 2020 · the nucleus (plural, nuclei) is defined as the dense, central part of an atom, consisting of two subatomic particles, namely protons and neutrons. They are thus the densest part of an atom. Oct 12, 2015 · the atomic nucleus is the center of an atom, which holds most of the atom's mass as well as its neutrons and protons. The nuclei of some atoms are spherical, while others are stretched or flattened into deformed shapes. Atom nucleus the nucleus is the center of mass (a), but does not significantly contribute to volume. Mass = 1 amu, charge = +1 neutrons:. Mass = 1 amu, charge = 0 electrons the electronic cloud determines the size, or

The following diagram summarizes the basic facts of the structure of the atom. Mass = 1 amu, charge = 0 electrons the electronic cloud determines the size, or According to his atom diagram, the atom has a small, positively charged nucleus in center. Protons and neutrons are found in the nucleus of an atom. The primary subatomic particles in the nuclei of atoms are protons and neutrons or nucleons (except hydrogen nuclei that contain only one proton). They make up a majority of the mass of an atom. Nov 24, 2020 · the nucleus (plural, nuclei) is defined as the dense, central part of an atom, consisting of two subatomic particles, namely protons and neutrons. This conclusion helped him propose 'rutherford's atomic model'. Explore the definition, structure, and size of the atomic nucleus. The nucleus is very small compared to the size of atom and the entire mass of an atom is centered in the nucleus.

Nov 24, 2020 · the nucleus (plural, nuclei) is defined as the dense, central part of an atom, consisting of two subatomic particles, namely protons and neutrons... They are thus the densest part of an atom. Mass = 1 amu, charge = 0 electrons the electronic cloud determines the size, or The same chemical element is characterized by the number of protons in the nucleus that determines the... The same chemical element is characterized by the number of protons in the nucleus that determines the.

They make up a majority of the mass of an atom. The primary subatomic particles in the nuclei of atoms are protons and neutrons or nucleons (except hydrogen nuclei that contain only one proton). This conclusion helped him propose 'rutherford's atomic model'. They are thus the densest part of an atom. Protons and neutrons are found in the nucleus of an atom. Mass = 1 amu, charge = 0 electrons the electronic cloud determines the size, or. Nucleus occupies an extremely small volume inside the atom.

The nucleus concentrates most of the atom's mass. The nucleus is very small compared to the size of atom and the entire mass of an atom is centered in the nucleus. A nucleus accounts for more than 99.9% of an atom's mass but is 100,000 times smaller than it in size. An atom is composed of two regions: They make up a majority of the mass of an atom. They are thus the densest part of an atom. Atom nucleus the nucleus is the center of mass (a), but does not significantly contribute to volume... They make up a majority of the mass of an atom.

The binding energy of a nucleus is the energy holding a nucleus together. They make up a majority of the mass of an atom. Atom nucleus the nucleus is the center of mass (a), but does not significantly contribute to volume. Protons and neutrons are found in the nucleus of an atom. A nucleus accounts for more than 99.9% of an atom's mass but is 100,000 times smaller than it in size. It is made up of: Jul 03, 2020 · which particles of an atom are only found in its nucleus? They are thus the densest part of an atom. The binding energy of a nucleus is the energy holding a nucleus together. An atom is composed of two regions:. The nucleus concentrates most of the atom's mass.

Oct 12, 2015 · the atomic nucleus is the center of an atom, which holds most of the atom's mass as well as its neutrons and protons.. This conclusion helped him propose 'rutherford's atomic model'. This nucleus carries the entire mass of the atom. They are thus the densest part of an atom. Jan 15, 2013 · the atomic nucleus is the small central part of the atom, with a positive electric charge. The nucleus is an organelle that contains the genetic information for that organism. The nuclei of some atoms are spherical, while others are stretched or flattened into deformed shapes. An atom is composed of two regions: Mass = 1 amu, charge = +1 neutrons: Mass = 1 amu, charge = 0 electrons the electronic cloud determines the size, or The nucleus concentrates most of the atom's mass... They make up a majority of the mass of an atom.

Explore the definition, structure, and size of the atomic nucleus... An atom is composed of two regions:. This nucleus carries the entire mass of the atom.

Mass = 1 amu, charge = +1 neutrons:. According to his atom diagram, the atom has a small, positively charged nucleus in center. Oct 12, 2015 · the atomic nucleus is the center of an atom, which holds most of the atom's mass as well as its neutrons and protons. It is made up of: The nucleus concentrates most of the atom's mass. Jan 15, 2013 · the atomic nucleus is the small central part of the atom, with a positive electric charge. In an animal cell, the nucleus is located in the central region of the. This nucleus carries the entire mass of the atom. The nucleus is very small compared to the size of atom and the entire mass of an atom is centered in the nucleus. Protons and neutrons are found in the nucleus of an atom... The following diagram summarizes the basic facts of the structure of the atom.

Nucleus occupies an extremely small volume inside the atom.. The primary subatomic particles in the nuclei of atoms are protons and neutrons or nucleons (except hydrogen nuclei that contain only one proton). Mass = 1 amu, charge = 0 electrons the electronic cloud determines the size, or It is made up of: The nucleus is an organelle that contains the genetic information for that organism. In an animal cell, the nucleus is located in the central region of the. They make up a majority of the mass of an atom. This nucleus carries the entire mass of the atom.

An atom is composed of two regions: Mass = 1 amu, charge = 0 electrons the electronic cloud determines the size, or This nucleus carries the entire mass of the atom. The same chemical element is characterized by the number of protons in the nucleus that determines the. The same chemical element is characterized by the number of protons in the nucleus that determines the.

Mass = 1 amu, charge = +1 neutrons:.. They make up a majority of the mass of an atom. Jul 03, 2020 · which particles of an atom are only found in its nucleus? Explore the definition, structure, and size of the atomic nucleus. According to his atom diagram, the atom has a small, positively charged nucleus in center. An atom is composed of two regions: The nucleus is an organelle that contains the genetic information for that organism. Protons and neutrons are found in the nucleus of an atom.. The same chemical element is characterized by the number of protons in the nucleus that determines the.

The primary subatomic particles in the nuclei of atoms are protons and neutrons or nucleons (except hydrogen nuclei that contain only one proton). Jul 03, 2020 · which particles of an atom are only found in its nucleus? The nuclei of some atoms are spherical, while others are stretched or flattened into deformed shapes. Jan 15, 2013 · the atomic nucleus is the small central part of the atom, with a positive electric charge. The binding energy of a nucleus is the energy holding a nucleus together. Mass = 1 amu, charge = 0 electrons the electronic cloud determines the size, or Oct 12, 2015 · the atomic nucleus is the center of an atom, which holds most of the atom's mass as well as its neutrons and protons. Atom nucleus the nucleus is the center of mass (a), but does not significantly contribute to volume. The nucleus, which is in the center of the atom and contains protons and neutrons, and the outer region of the atom, which holds its electrons in orbit around the nucleus.. This nucleus carries the entire mass of the atom.

Mass = 1 amu, charge = 0 electrons the electronic cloud determines the size, or The nucleus, which is in the center of the atom and contains protons and neutrons, and the outer region of the atom, which holds its electrons in orbit around the nucleus. A nucleus accounts for more than 99.9% of an atom's mass but is 100,000 times smaller than it in size. They are thus the densest part of an atom. It is made up of:. Nucleus occupies an extremely small volume inside the atom.

The nucleus is an organelle that contains the genetic information for that organism. This nucleus carries the entire mass of the atom. Nucleus occupies an extremely small volume inside the atom. The nucleus is very small compared to the size of atom and the entire mass of an atom is centered in the nucleus. According to his atom diagram, the atom has a small, positively charged nucleus in center. Atom nucleus the nucleus is the center of mass (a), but does not significantly contribute to volume. They are thus the densest part of an atom. Mass = 1 amu, charge = 0 electrons the electronic cloud determines the size, or.. The nucleus, which is in the center of the atom and contains protons and neutrons, and the outer region of the atom, which holds its electrons in orbit around the nucleus.

It is made up of:. The nucleus is very small compared to the size of atom and the entire mass of an atom is centered in the nucleus. Jul 03, 2020 · which particles of an atom are only found in its nucleus? They are thus the densest part of an atom. This nucleus carries the entire mass of the atom. The nuclei of some atoms are spherical, while others are stretched or flattened into deformed shapes. This conclusion helped him propose 'rutherford's atomic model'. A nucleus accounts for more than 99.9% of an atom's mass but is 100,000 times smaller than it in size. Jan 15, 2013 · the atomic nucleus is the small central part of the atom, with a positive electric charge.

It is made up of:.. The nucleus, which is in the center of the atom and contains protons and neutrons, and the outer region of the atom, which holds its electrons in orbit around the nucleus. Explore the definition, structure, and size of the atomic nucleus. According to his atom diagram, the atom has a small, positively charged nucleus in center.

The binding energy of a nucleus is the energy holding a nucleus together. The following diagram summarizes the basic facts of the structure of the atom. In an animal cell, the nucleus is located in the central region of the. Protons and neutrons are found in the nucleus of an atom. The nucleus is an organelle that contains the genetic information for that organism. This conclusion helped him propose 'rutherford's atomic model'. Atom nucleus the nucleus is the center of mass (a), but does not significantly contribute to volume... This nucleus carries the entire mass of the atom.

Oct 12, 2015 · the atomic nucleus is the center of an atom, which holds most of the atom's mass as well as its neutrons and protons... The following diagram summarizes the basic facts of the structure of the atom. Protons and neutrons are found in the nucleus of an atom. They make up a majority of the mass of an atom. The nuclei of some atoms are spherical, while others are stretched or flattened into deformed shapes. A nucleus accounts for more than 99.9% of an atom's mass but is 100,000 times smaller than it in size. It is made up of: The nucleus is an organelle that contains the genetic information for that organism. An atom is composed of two regions:.. According to his atom diagram, the atom has a small, positively charged nucleus in center.

In an animal cell, the nucleus is located in the central region of the. They make up a majority of the mass of an atom. Mass = 1 amu, charge = +1 neutrons: Mass = 1 amu, charge = 0 electrons the electronic cloud determines the size, or The nucleus concentrates most of the atom's mass. According to his atom diagram, the atom has a small, positively charged nucleus in center. The nuclei of some atoms are spherical, while others are stretched or flattened into deformed shapes. Atom nucleus the nucleus is the center of mass (a), but does not significantly contribute to volume. An atom is composed of two regions:. Mass = 1 amu, charge = 0 electrons the electronic cloud determines the size, or

The primary subatomic particles in the nuclei of atoms are protons and neutrons or nucleons (except hydrogen nuclei that contain only one proton). In an animal cell, the nucleus is located in the central region of the. According to his atom diagram, the atom has a small, positively charged nucleus in center. This nucleus carries the entire mass of the atom. The nucleus is very small compared to the size of atom and the entire mass of an atom is centered in the nucleus. The binding energy of a nucleus is the energy holding a nucleus together. A nucleus accounts for more than 99.9% of an atom's mass but is 100,000 times smaller than it in size. The nucleus concentrates most of the atom's mass.. Explore the definition, structure, and size of the atomic nucleus.

Oct 12, 2015 · the atomic nucleus is the center of an atom, which holds most of the atom's mass as well as its neutrons and protons. They make up a majority of the mass of an atom. In an animal cell, the nucleus is located in the central region of the. Explore the definition, structure, and size of the atomic nucleus. An atom is composed of two regions: This conclusion helped him propose 'rutherford's atomic model'.. They make up a majority of the mass of an atom.

Nov 24, 2020 · the nucleus (plural, nuclei) is defined as the dense, central part of an atom, consisting of two subatomic particles, namely protons and neutrons... The nucleus, which is in the center of the atom and contains protons and neutrons, and the outer region of the atom, which holds its electrons in orbit around the nucleus. The nucleus concentrates most of the atom's mass. The primary subatomic particles in the nuclei of atoms are protons and neutrons or nucleons (except hydrogen nuclei that contain only one proton). The nucleus is very small compared to the size of atom and the entire mass of an atom is centered in the nucleus. An atom is composed of two regions: The nucleus is an organelle that contains the genetic information for that organism. According to his atom diagram, the atom has a small, positively charged nucleus in center. This nucleus carries the entire mass of the atom. It is made up of:

This conclusion helped him propose 'rutherford's atomic model'.. Oct 12, 2015 · the atomic nucleus is the center of an atom, which holds most of the atom's mass as well as its neutrons and protons. The nucleus is an organelle that contains the genetic information for that organism. This conclusion helped him propose 'rutherford's atomic model'. The nucleus, which is in the center of the atom and contains protons and neutrons, and the outer region of the atom, which holds its electrons in orbit around the nucleus. Jul 03, 2020 · which particles of an atom are only found in its nucleus? This nucleus carries the entire mass of the atom. A nucleus accounts for more than 99.9% of an atom's mass but is 100,000 times smaller than it in size.

The nucleus, which is in the center of the atom and contains protons and neutrons, and the outer region of the atom, which holds its electrons in orbit around the nucleus. A nucleus accounts for more than 99.9% of an atom's mass but is 100,000 times smaller than it in size. Nucleus occupies an extremely small volume inside the atom. The nuclei of some atoms are spherical, while others are stretched or flattened into deformed shapes. The same chemical element is characterized by the number of protons in the nucleus that determines the. According to his atom diagram, the atom has a small, positively charged nucleus in center. Mass = 1 amu, charge = 0 electrons the electronic cloud determines the size, or They are thus the densest part of an atom. Jan 15, 2013 · the atomic nucleus is the small central part of the atom, with a positive electric charge. It is made up of: Atom nucleus the nucleus is the center of mass (a), but does not significantly contribute to volume. Oct 12, 2015 · the atomic nucleus is the center of an atom, which holds most of the atom's mass as well as its neutrons and protons.

This nucleus carries the entire mass of the atom. Jan 15, 2013 · the atomic nucleus is the small central part of the atom, with a positive electric charge. This conclusion helped him propose 'rutherford's atomic model'. The nucleus, which is in the center of the atom and contains protons and neutrons, and the outer region of the atom, which holds its electrons in orbit around the nucleus. A nucleus accounts for more than 99.9% of an atom's mass but is 100,000 times smaller than it in size. The same chemical element is characterized by the number of protons in the nucleus that determines the. A nucleus accounts for more than 99.9% of an atom's mass but is 100,000 times smaller than it in size.

Protons and neutrons are found in the nucleus of an atom. Protons and neutrons are found in the nucleus of an atom... The nucleus, which is in the center of the atom and contains protons and neutrons, and the outer region of the atom, which holds its electrons in orbit around the nucleus.

The nucleus is an organelle that contains the genetic information for that organism.. .. The following diagram summarizes the basic facts of the structure of the atom.

Mass = 1 amu, charge = +1 neutrons: Jul 03, 2020 · which particles of an atom are only found in its nucleus? The following diagram summarizes the basic facts of the structure of the atom. According to his atom diagram, the atom has a small, positively charged nucleus in center. An atom is composed of two regions: A nucleus accounts for more than 99.9% of an atom's mass but is 100,000 times smaller than it in size. Mass = 1 amu, charge = 0 electrons the electronic cloud determines the size, or They make up a majority of the mass of an atom. Jan 15, 2013 · the atomic nucleus is the small central part of the atom, with a positive electric charge... The nucleus concentrates most of the atom's mass.

Nov 24, 2020 · the nucleus (plural, nuclei) is defined as the dense, central part of an atom, consisting of two subatomic particles, namely protons and neutrons. The nucleus, which is in the center of the atom and contains protons and neutrons, and the outer region of the atom, which holds its electrons in orbit around the nucleus. The following diagram summarizes the basic facts of the structure of the atom. Atom nucleus the nucleus is the center of mass (a), but does not significantly contribute to volume. This conclusion helped him propose 'rutherford's atomic model'. The binding energy of a nucleus is the energy holding a nucleus together. The same chemical element is characterized by the number of protons in the nucleus that determines the. The nuclei of some atoms are spherical, while others are stretched or flattened into deformed shapes. Protons and neutrons are found in the nucleus of an atom. They are thus the densest part of an atom. Nucleus occupies an extremely small volume inside the atom.

The nuclei of some atoms are spherical, while others are stretched or flattened into deformed shapes. The same chemical element is characterized by the number of protons in the nucleus that determines the. Protons and neutrons are found in the nucleus of an atom. Atom nucleus the nucleus is the center of mass (a), but does not significantly contribute to volume. Nov 24, 2020 · the nucleus (plural, nuclei) is defined as the dense, central part of an atom, consisting of two subatomic particles, namely protons and neutrons.. An atom is composed of two regions:

They are thus the densest part of an atom... The same chemical element is characterized by the number of protons in the nucleus that determines the. The primary subatomic particles in the nuclei of atoms are protons and neutrons or nucleons (except hydrogen nuclei that contain only one proton). Explore the definition, structure, and size of the atomic nucleus. Nov 24, 2020 · the nucleus (plural, nuclei) is defined as the dense, central part of an atom, consisting of two subatomic particles, namely protons and neutrons. The nucleus is very small compared to the size of atom and the entire mass of an atom is centered in the nucleus. The nucleus is an organelle that contains the genetic information for that organism.

This conclusion helped him propose 'rutherford's atomic model'. . Mass = 1 amu, charge = 0 electrons the electronic cloud determines the size, or

The following diagram summarizes the basic facts of the structure of the atom. According to his atom diagram, the atom has a small, positively charged nucleus in center. An atom is composed of two regions: The nucleus, which is in the center of the atom and contains protons and neutrons, and the outer region of the atom, which holds its electrons in orbit around the nucleus.

Protons and neutrons are found in the nucleus of an atom... The nucleus is an organelle that contains the genetic information for that organism. They are thus the densest part of an atom. According to his atom diagram, the atom has a small, positively charged nucleus in center. Jul 03, 2020 · which particles of an atom are only found in its nucleus? Mass = 1 amu, charge = +1 neutrons: The nuclei of some atoms are spherical, while others are stretched or flattened into deformed shapes. Atom nucleus the nucleus is the center of mass (a), but does not significantly contribute to volume.. They make up a majority of the mass of an atom.

Jan 15, 2013 · the atomic nucleus is the small central part of the atom, with a positive electric charge.. They are thus the densest part of an atom. The nuclei of some atoms are spherical, while others are stretched or flattened into deformed shapes... The primary subatomic particles in the nuclei of atoms are protons and neutrons or nucleons (except hydrogen nuclei that contain only one proton).

An atom is composed of two regions:. The nucleus, which is in the center of the atom and contains protons and neutrons, and the outer region of the atom, which holds its electrons in orbit around the nucleus. According to his atom diagram, the atom has a small, positively charged nucleus in center. Atom nucleus the nucleus is the center of mass (a), but does not significantly contribute to volume. Nucleus occupies an extremely small volume inside the atom. Mass = 1 amu, charge = +1 neutrons: Jan 15, 2013 · the atomic nucleus is the small central part of the atom, with a positive electric charge. Nov 24, 2020 · the nucleus (plural, nuclei) is defined as the dense, central part of an atom, consisting of two subatomic particles, namely protons and neutrons. The nucleus is very small compared to the size of atom and the entire mass of an atom is centered in the nucleus.. They are thus the densest part of an atom.

Explore the definition, structure, and size of the atomic nucleus. The following diagram summarizes the basic facts of the structure of the atom. Protons and neutrons are found in the nucleus of an atom. In an animal cell, the nucleus is located in the central region of the. The primary subatomic particles in the nuclei of atoms are protons and neutrons or nucleons (except hydrogen nuclei that contain only one proton). Oct 12, 2015 · the atomic nucleus is the center of an atom, which holds most of the atom's mass as well as its neutrons and protons. Nov 24, 2020 · the nucleus (plural, nuclei) is defined as the dense, central part of an atom, consisting of two subatomic particles, namely protons and neutrons. Mass = 1 amu, charge = 0 electrons the electronic cloud determines the size, or Mass = 1 amu, charge = +1 neutrons:. Mass = 1 amu, charge = 0 electrons the electronic cloud determines the size, or

A nucleus accounts for more than 99.9% of an atom's mass but is 100,000 times smaller than it in size.. It is made up of: Nov 24, 2020 · the nucleus (plural, nuclei) is defined as the dense, central part of an atom, consisting of two subatomic particles, namely protons and neutrons. They are thus the densest part of an atom. The nucleus concentrates most of the atom's mass. A nucleus accounts for more than 99.9% of an atom's mass but is 100,000 times smaller than it in size. According to his atom diagram, the atom has a small, positively charged nucleus in center. Mass = 1 amu, charge = +1 neutrons: An atom is composed of two regions:.. They make up a majority of the mass of an atom.

It is made up of:.. Nov 24, 2020 · the nucleus (plural, nuclei) is defined as the dense, central part of an atom, consisting of two subatomic particles, namely protons and neutrons. Jan 15, 2013 · the atomic nucleus is the small central part of the atom, with a positive electric charge. An atom is composed of two regions: Mass = 1 amu, charge = +1 neutrons: The nuclei of some atoms are spherical, while others are stretched or flattened into deformed shapes. Jul 03, 2020 · which particles of an atom are only found in its nucleus? The same chemical element is characterized by the number of protons in the nucleus that determines the. The nucleus concentrates most of the atom's mass... The primary subatomic particles in the nuclei of atoms are protons and neutrons or nucleons (except hydrogen nuclei that contain only one proton).

This conclusion helped him propose 'rutherford's atomic model'. The same chemical element is characterized by the number of protons in the nucleus that determines the. In an animal cell, the nucleus is located in the central region of the. According to his atom diagram, the atom has a small, positively charged nucleus in center... In an animal cell, the nucleus is located in the central region of the.

The following diagram summarizes the basic facts of the structure of the atom... Explore the definition, structure, and size of the atomic nucleus. They are thus the densest part of an atom. Mass = 1 amu, charge = +1 neutrons: The nucleus is an organelle that contains the genetic information for that organism. Oct 12, 2015 · the atomic nucleus is the center of an atom, which holds most of the atom's mass as well as its neutrons and protons.

The same chemical element is characterized by the number of protons in the nucleus that determines the... A nucleus accounts for more than 99.9% of an atom's mass but is 100,000 times smaller than it in size. Nucleus occupies an extremely small volume inside the atom. An atom is composed of two regions: Mass = 1 amu, charge = +1 neutrons: Jan 15, 2013 · the atomic nucleus is the small central part of the atom, with a positive electric charge. According to his atom diagram, the atom has a small, positively charged nucleus in center. Oct 12, 2015 · the atomic nucleus is the center of an atom, which holds most of the atom's mass as well as its neutrons and protons. The primary subatomic particles in the nuclei of atoms are protons and neutrons or nucleons (except hydrogen nuclei that contain only one proton). In an animal cell, the nucleus is located in the central region of the.. It is made up of:

Explore the definition, structure, and size of the atomic nucleus. They are thus the densest part of an atom. Nov 24, 2020 · the nucleus (plural, nuclei) is defined as the dense, central part of an atom, consisting of two subatomic particles, namely protons and neutrons. The nuclei of some atoms are spherical, while others are stretched or flattened into deformed shapes. Mass = 1 amu, charge = 0 electrons the electronic cloud determines the size, or This nucleus carries the entire mass of the atom. Nov 24, 2020 · the nucleus (plural, nuclei) is defined as the dense, central part of an atom, consisting of two subatomic particles, namely protons and neutrons.

The nucleus is very small compared to the size of atom and the entire mass of an atom is centered in the nucleus. According to his atom diagram, the atom has a small, positively charged nucleus in center. The nucleus concentrates most of the atom's mass. Nov 24, 2020 · the nucleus (plural, nuclei) is defined as the dense, central part of an atom, consisting of two subatomic particles, namely protons and neutrons. Protons and neutrons are found in the nucleus of an atom.. This nucleus carries the entire mass of the atom.