Question

define atomic number and mass number​

Answer 1

Answer:

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

Answer:

ATOMIC NUMBER: atomic number is the no. of electrons present in one atom of an element.

eg: atomic no of oxygen is 6. so it has 6 electrons.

MASS NUMBER: mass number is the sum of protons and neutrons in an atom..

I HOPE THIS ANSWER HELPED YOU!!

PLEASE MARK THIS ANSWER AS BRAINLIST :)