Question

why electron orbit nucleus of a atom

Answer 1

Nucleus contains protons and neutrons.Protons have positive charge and neutron don't have charge.So,the nucleus as whole is positive.Electrons contains negative charge.Electrons(negative charge) orbit around the nucleus of the Atom due to the attraction of the nucleus (positive charge).

Answer 2

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An electron in an atom spreads out according to its energy. The states with more energy are more spread out. All electron states overlap with the nucleus, so the concept of an electron "falling into" or "entering" the nucleus does not really make sense. Electrons are always partially in the nucleus.