The electrons revolving close to the nucleus of an atom are called ................. electrons.

free

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positive charge

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bound

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attract

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Solution

The correct option is D bound
The electrons revolving close to the nucleus of an atom are called bound electrons.
An electron is a negatively charged subatomic particle. It can be either free, or bound to the nucleus of an atom. Electrons in atoms exist in spherical shells of various radii, representing energy levels. The larger the spherical shell, the higher the energy contained in the electron.Hence correct option is C

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