The mass of which of the following is the least?
A) A proton
B) A neutron
C) An electron
D) A hydrogen atom
E) A hydrogen nucleus

Question

Quizplus · Accepted Answer

An electron has the least mass among the given options. The mass of a proton is 1.007 atomic mass units (amu), the mass of a neutron is 1.008 amu, the mass of a hydrogen atom is 1.008 amu, and the mass of a hydrogen nucleus (i.e. a proton) is 1.007 amu, while the mass of an electron is 0.000549 amu, which is almost 1836 times lighter than a proton. Therefore, option C, an electron, has the least mass.

The Mass of Which of the Following Is the Least