Question : Which one of the following has greatest mass?
Option 1: electron
Option 2: proton
Option 3: neutron
Option 4: hydrogen nucleus
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Correct Answer: neutron
Solution : The correct option is neutron.
The neutron has the greatest mass among the proton, neutron, electron, and nucleus of hydrogen. The mass of a proton is 1.672621777(74) × 10 -27 kg. The mass of a neutron is 1.674927498(94) × 10 -27 kg. The mass of an electron is 9.1093837015(28) × 10 -31 kg. The mass of a hydrogen nucleus is 1.674927498(94) × 10 -27 kg. A neutron's mass is somewhat larger than that of a proton. An electron's mass is substantially lower than that of a proton or neutron. Because a hydrogen nucleus contains just one proton, its mass is the same as that of a proton.
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