An electron has a

Negligible mass.

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Relative charge of -1.

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Charge that is opposite and equal to a proton.

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All of these.

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Solution

The correct option is D All of these.
An electron has a negligible mass, a charge of -1 which is the opposite charge on a proton.
The electron is a subatomic (smaller than an atom) particle that carries a single unit of negative charge.
The size of the nucleus is many thousands of times smaller than the size of the atom itself. Electrons are distributed in specific regions outside the nucleus.

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