Question

why the electron not present in the place of proton?​

Answer 1

An electron will only react with a proton in the nucleus via electron capture if there are too many protons in the nucleus. ... But most atoms do not have too many protons, so there is nothing for the electron to interact with. As a result, each electron in a stable atom remains in its spread-out wavefunction shape.
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Answer 2

Answer:

An electron will only react with a proton in the nucleus via electron capture if there are too many protons in the nucleus. ... But most atoms do not have too many protons, so there is nothing for the electron to interact with. As a result, each electron in a stable atom remains in its spread-out wavefunction shape.

Because they are negatively charged.