The mass number
The sum of all Protons and Neutrons.
Mass number = Protons+Neutrons
The sum of protons and neutrons in an atom is called mass number.
The sum of all protons and neutrons - Apex Learning
Sum of protons and neutrons is the Mass number of the element. The number of protons is equal to the number of electrons. Neutrons and protons are sub atomic particles.
The sum of protons and neutrons is the atomic mass.
The sum of the number of protons and neutrons in an atom
Isotopes involve different atomic masses. It is sum of number of protons and neutrons.
40, the sum of the protons and neutrons.
Mass number!:)
the mass number
No. The number of neutrons has no affect on the number of protons and electrons.