The sum is called mass number.
The total amount of protons and neutrons in an atom is its mass number.
If you add the number of protons to the number of neutrons in an atom, you have calculated that atom's atomic mass.
mass number = protons + nuetrons
The mass number is the sum of protons + neutrons.
Mass number!:)
20. the mass of an atom is determined by the sum of the number of neutrons and protons the atom has.
The total number of protons and neutrons in an atom is given by the atomic mass number, which is the sum of the number of protons (atomic number) and the number of neutrons in the nucleus of the atom.
The atomic mass of an atom is the sum of the number of protons and neutrons in its nucleus. Therefore, if an atom has 16 neutrons, its atomic mass would be the total of the protons and neutrons. For example, if the atom has 8 protons, the atomic mass would be 16 (neutrons) + 8 (protons) = 24.
protons and neutrons are located in the atom's nucleus.
The atomic mass of an atom is the total mass of protons, neutrons, and electrons in the atom, measured in atomic mass units (amu). It is approximately equal to the sum of the number of protons and neutrons in the atom's nucleus.
atomic mass number - protons = number or neutrons
An atom with 29 protons and 31 neutrons would be the element copper (Cu). This atom would have a total of 60 nucleons (protons + neutrons).