Question

All the mass of an atom is concentrated in yhe nucleus .
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Answer 1

Answer:

yes, because nucleus is an central part of an atom .the smallest unit of any thing is atom, as in living life cell is basic structural and functional unit of life as well as nucleus of atom is the point source and binding particle an atom content proton, neutron and electron

no. of protons and no. of electrons are same

Answer 2

Answer:

1. An atom contain proton,neutrons and electron. The mass of electron very less. So we can avoid this. The mass of proton is the mass of one hydrogen atom. The mass of one neutron is mass of one hydrogen atom. The neutrons and protons are present at the nucleus. As particles which contain mass is at the nucleus then the mass of the atom is at the nucleus.