Rest mass of neutron, and rest mass of proton.
If you mean the symbol, mn0 and mp0.
If you mean the values, to 4 significant figures 1.673*10^-27kg for a proton, 1.675*10^-27kg for a neutron.
mass number = protons + nuetrons
The total mass of the protons and neutrons in an atom is called the atomic mass or mass number. It is often represented by the symbol A.
The number protons in an atom is called the atomic number (it is this number that tells us which element the atom is). The number of neutrons in an atom can change, but the term for the amount of neutrons is called an isotope. The number of protons and neutrons added together is called the atomic mass.
The sum of protons and neutrons in an atom is called mass number.
Neutrons are the particles that contribute to the mass of an atom, along with protons. Neutrons have a similar mass to protons, but they do not have a charge. The number of protons and neutrons in an atom's nucleus determines its atomic mass.
The atomic mass
The atomic mass of an atom is determined by the sum of the number of protons and neutrons in its nucleus. Protons have a positive charge, and neutrons have no charge. The total number of protons and neutrons in an atom's nucleus is called its mass number.
The combined number of protons and neutrons is known as the mass number of an atom. It can be used to calculate the atomic mass by adding the total number of protons and neutrons in the nucleus of an atom.
Mass number is about the neutrons and protons. The total of neutrons and protons.
Mass number
mass number = protons + nuetrons
Physics has not managed to discover a particle that accounts for mass