Which of the following particle has mass closest to the mass of a proton?

Neutron

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Hydrogen molecule

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Alpha particle

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Positron

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Electron

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Solution

The correct option is A Neutron
Neutron has closest mass to a proton. The mass of proton and neutron are 1.0073 amu and 1.0087 amu respectively. Mass of electron is much lower than that of proton and neutron

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