Question

All the mass of an atom
concentrated in
the nucleus ​

Answer 1

Answer:

Explanation:

The mass of atom is concentrated in nucleus because electrons which are outside the nucleus have very less mass as compared to proton and neutron which are inside the nucleus.

Hence protons and neutrons are inside nucleus so mass is concentrated in nucleus

Answer 2

Answer:

becouse Most of the mass of the atom is concentrated in the nucleus, which has a positive charge, and other mass having -ve charge most of electron sorrounding in medium