The atomic mass of an element
A) is determined by its protons and neutrons.
B) equals the number of protons plus the number of electrons.
C) equals the number of neutrons.
D) changes after each reaction.
E) depends on the number of electrons in the outermost shell.

Question

Quizplus · Accepted Answer

The atomic mass is essentially the sum of protons and neutrons in the nucleus; it is not changed by chemical reactions. The mass of electrons is negligible.

The Atomic Mass of an Element