Question

what is an atom atomic mass atomic no

Answer 1

Here is your answer.....

Atomic Number : The atomic number is the number of protons in the atom.

Atomic Mass : atomic mass is roughly equal to the sum of the individual particle masses of an atom. Atomic mass is typically calculated by adding the number of protons and neutrons together, ignoring the electrons because of their small size.

I hope it helps you ^_^ .... 

Answer 2

Answer:

Atomic mass/ Mass number is the the sum of the protons and neutrons in an atom.

Whereas Atomic number is the number of protons present in an atom.