Electrons doesn't exist in nucleus explain why
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This is mainly because electrons are in constant motion... the free electrons help us in transmission of electricity.. electrons also play a great role in forming compounds as only the number of electrons in the outer shell decide the valency of elements.
If electrons were bound to a nucleus, we would need a lot of energy to form compounds, as then we would have to break down the nucleus to set the electrons free.
The electrons, with their negative charge, have to remain separate from the positively-charged protons of the nucleus so that charge can be carried and transmitted.
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