Question

define atomic number and atomic mass number​

Answer 1

Answer:

The atomic number uniquely identifies a chemical element. It is identical to the charge number of the nucleus. In an uncharged atom, the atomic number is also equal to the number of electrons. The sum of the atomic number Z and the number of neutrons N gives the mass number A of an atom.

Answer 2

Answer:

Atomic Number: The number of protons present in an atom is known as Atomic number. Mass Number: Mass number is the sum of the number of neutrons and protons of an atom. ... Mass Number: The mass number of an atom is not affected by the number of neutrons.