Question

what is the relation between the atomic & mass number of an element​

Answer 1

Answer:

Atomic Number and Mass Number

While the mass number is the sum of the protons and neutrons in an atom, the atomic number is only the number of protons. The atomic number is the value found associated with an element on the periodic table because it is the key to the element's identity.

Answer 2

Answer:

atomic no is the no of proton present in the nucleus while mass no. is the no. of nucleons ( no. of protons+ no. of neutrons)

soo the mass no. - no. of neutrons gives you atomic no.