Question

the mass of an atom is concentrated at the nucleus. why?

Answer 1

this is because only in the nucleus all the protons and neutrons are found
and in the shells only electrons are there and thee mass is almost negligible

Answer 2

HEY MATE!!

MASS OF AN ATOM IS CONCENTRATED TO NUCLEUS BECAUSE NEUTRON AND PROTON ARE INSIDE THE NUCLEUS....


HOPE IT HELPS U