Question

What is atomic number and mass number?​

Answer 1

Step-by-step explanation:

The number of protons determines an element's atomic number and is used to distinguish one element from another. ... Together, the number of protons and the number of neutrons determine an element's mass number.

Answer 2

$\sf \Large Answer!!$

Atom number (Z) => The atomic number of an atom is equal to the number of protons in its nucleus (which is same as the number of electrons in a neutral atom).

Mass number (A) => The mass number of an atom is equal to the total number of nucleons (i.e., the sum of the number of protons and the number of neutrons) in its nucleus.

Z = Number of protons in the nucleus of an atom

A = Number of protons + Number of neutrons of an atom