Question

If unlike charges attract each other, then why the electrons are not get attracted by protons in an atom???

Answer 1

This happens because each and every electron in an atom is present in fixed shells and each shell has fixed energy levels. That's why they don't fall into the nucleus

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Answer 2

In an atom electrons revolve around the nucleus in fixed energy levels as per Bohr's theory. So they have a constant supply of energy and are not attracted by the nucleons.