Question

define lsotopes and mass number​

Answer 1

Explanation:

Isotopes:- The elements with same atomic numbers but different mass numbers.

Mass number:- The sum of numbers of protons and number of neutrons in an atom.

Answer 2

Answer:

two or more atoms having same atomic no. but different mass no. is called isotopes.

mass no. -sum of total no. of proton and neutron of an atom is called its mass no.