An atom's mass number is 13 and its atomic number is 6. How many neutrons are in its nucleus?
A) 13
B) 6
C) 7
D) 19

Question

Quizplus · Accepted Answer

The number of neutrons in an atom can be calculated by subtracting the atomic number (which represents the number of protons) from the mass number (which represents the sum of protons and neutrons). In this case, 13-6=7 neutrons. Therefore, the correct answer is choice C.

An Atom's Mass Number Is 13 and Its Atomic Number