The mass of an electron is less than that of a atom.

hydrogen

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sodium

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carbon

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Solution

The correct option is A hydrogen
The mass of an electron is very less compared to that of an atom; it's so low that it's often neglected when compared to the mass of an entire atom.

The electron is about 2000 times lighter than a proton. So, the mass of an electron is indeed lesser than that of a hydrogen atom.

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