Answer / shweta

nucleus is made of proton and neutron. Proton is positively
chrged and neutron hav no charge. As electrons are
negatively charged the protons present in the nucleus
attract the elctrons surronding in their orbits. Thats the
only reason when electrons get excited they go to upper
level but after some time it returns to its original orbit.

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1 Answers   NSN,

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