How to Display Atomic Number and Mass with Examples

4   Atomic Number and Mass with Examples

Atomic Number is the number of protons indicated to the upper right of the Atom Letter. While Atomic Mass is the number of protons and neutron and goes to the lower right of the Atom Letter. While the Atomic Number remains the same for specific atom, the Mass number can vary between isotopes of that atom as there can be a different number of neutrons.