Question

why all the mass of an atom is concentrated in the nucleus????​

Answer 1

Answer:

because, nucleus contain proton and neutron revolve around nucleus. electrons are negligible mass. therefore mass of an atom is concentrated in the nnucleu.

Answer 2

Answer:

All the mass of an atom is concentrated in the nucleus because atom contains three subatomic particles like electron, proton and neutron.Out of which, nucleus present at the centre of an atom contains two subatomic particles that's protons and neutrons and the mass of nucleus is the sum of mass of protons and neutrons ...