The atomic mass unit is defined as
A)the mass of a proton.
B)the mass of an electron.
C)the mass of a hydrogen-1 atom.
D)one twelfth the mass of a carbon-12 atom.
E)the mass of a carbon-12 nucleus.

Question

Quizplus · Accepted Answer

The atomic mass unit (amu) is defined as one twelfth of the mass of a carbon-12 atom. It is used as a standard for measuring the masses of other atoms and molecules in atomic mass units.

The Atomic Mass Unit Is Defined as