Question

Where is the mass of an atom found? Expain.

Answer 1

in its neutron , because it contains proton and neutron which make up almost all mass of am atom , we don't count electron in it because they have mass that is almost negligible so it don't effect toe over all answer.

Answer 2

the mass of atom is concentrated in nucleus of an atom .

atomic mass = sum of mass of proton + neutron ..

it is denoted by (A ) in atomic mass unit.