The mass number of an atom can be calculated from ________.
A)the number of electrons
B)the number of protons plus neutrons
C)the number of protons
D)the number of electrons plus protons
E)the number of neutrons

Question

Quizplus · Accepted Answer

The mass number of an atom is the sum of its protons and neutrons. Therefore, option B, which states "the number of protons plus neutrons," is the correct choice. Options A, C, D, and E are incorrect because they do not provide the sum of protons and neutrons.

The Mass Number of an Atom Can Be Calculated from ________