Chapter 4 - Atomic Structure - 4 Assessment - Page 122: 50

Mass number represents that total amount of protons and neutrons in an element. The atomic number represents that total amount of protons in an element.

Mass number represents that total amount of protons and neutrons in an element. The atomic number represents that total amount of protons in an element. Atomic mass accounts for neutrons and protons, while atomic number only accounts for protons.