Question

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

Answer:

All the mass of an atom is concentrated in the nucleus because atom contains three subatomic particles like electron, proton and neutron. ... So, charge on negatively charged electrons are balanced by charge on positively charged proton.

Explanation:

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Answer 2

Answer:

The mass is concentrated at the nucleus because it consist of neutrons and proton which are heavier in mass than the electrons revolving in the orbits.