Which of the following is the best definition of the atomic mass unit?
A)Exactly 1/12 of the mass of a carbon-12 atom
B)The average mass of the atoms of an element compared to an atom of carbon-12 at exactly 12 u
C)The total number of protons and neutrons in the nucleus of an atom of carbon-12
D)Exactly 1/12 of the mass of a carbon-12 nucleus
E)Exactly 1/12 of the mass of 12 neutrons in a neutral electrical field

Question

Quizplus · Accepted Answer

The atomic mass unit (amu) is defined as exactly 1/12 of the mass of a carbon-12 atom, so choice A is the best definition.

Which of the Following Is the Best Definition of the Atomic