The mass number of an atom is determined by
A)adding the total number of protons, neutrons and electrons.
B)determining the number of protons in the outer shell.
C)adding the total number of neutrons, protons and proteins.
D)determining the number of protons in the nucleus.
E)adding the total number of protons and neutrons.

Question

Quizplus · Accepted Answer

The mass number of an atom is determined by adding the total number of protons and neutrons in the nucleus. This is because the mass number represents the total mass of an atom, and the electrons have negligible mass compared to protons and neutrons.

The Mass Number of an Atom Is Determined by