A Mass Number (A) of an atom is the sum of the number of protons and neutrons in the atomic nucleus. The Mass Number is never smaller than the atomic number.
Related Definitions in the Project: The Property and Unit
A Mass Number (A) of an atom is the sum of the number of protons and neutrons in the atomic nucleus. The Mass Number is never smaller than the atomic number.
Related Definitions in the Project: The Property and Unit