One atomic mass unit is equal to one-twelfth of the mass of an atom of _____.
A) carbon with six protons and six neutrons
B) hydrogen with one proton and one neutron
C) oxygen with eight protons and eight neutrons
D) sodium with 11 atoms and 12 neutrons
E) magnesium with 12 atoms and 12 neutrons

Question

Quizplus · Accepted Answer

One atomic mass unit is defined as one-twelfth of the mass of a carbon-12 atom, which has six protons and six neutrons.

One Atomic Mass Unit Is Equal to One-Twelfth of the Mass