Which has the greatest mass?

(A) electron
(B) proton
(C) neutron
(D) hydrogen nucleus

Correct Answer : neutron
Explanation : Mass of proton is 1.672621777(74) × 1027 kg. An electron has a mass (9.10938291(40) × 1031 kg) that is approximately 1/1836 that of the proton. The mass of neutron is slightly larger than that of a proton. The mass of the hydrogen nucleus is 4.7 × 1027 kg.
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