Question

which of these describes the mass of an electron?
○ 2,000 times smaller than either a neutron or a proton
○ 20,000 times smaller than either a neutron or a proton
○ 200 times smaller than either a neutron or a proton
○ 20 times smaller than either a neutron or a proton

Explanation:

To determine the correct description of an electron's mass relative to a neutron or proton, we recall atomic particle mass knowledge: protons and neutrons have nearly equal masses (≈1 atomic mass unit), while an electron's mass is about 1/1836 (≈1/2000) of a proton/neutron's mass. So the electron is ~2000 times smaller.

Answer:

A. 2,000 times smaller than either a neutron or a proton