Question

what is the atomic number? how does it differ from the mass number ?​

Answer 1

Answer:

Atomic no. is the total no. of electron

mass no. is the total no. of protons + total no. of neutrons

Answer 2

atomic no is the no of protons present in the nucleus of an atom.

but mass no is the sum of no of protons and neutrons present in the nucleus of an atom thus they are different. example atomic no of helium whereas mass no is4