How much heavier is a hydrogen atom than a proton?
A) twice as heavy
B) 1 part in 2000
C) 2000 times heavier
D) A hydrogen atom is lighter than a proton.

Question

Quizplus · Accepted Answer

A hydrogen atom consists of a proton and an electron. The mass of an electron is negligible compared to that of a proton. Therefore, the difference in mass between a hydrogen atom and a proton is mainly due to the mass of the electron. This mass difference is about 1 part in 2000.

How Much Heavier Is a Hydrogen Atom Than a Proton