Question

why electrons cannot be present inside the nucleus? solve numerically​

Answer 1

Answer:

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The electron can exist inside a nucleus. It just can't stay there every long as a free electron because it would have to radiate way its orbital energy, and it cannot do that because there is no stable energy level for it.

@SmartSwagger

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.