The number of neutrons in an atom is equal to
A)the mass number + the atomic number.
B)the atomic number.
C)the number of protons.
D)the mass number.
E)the mass number - the atomic number.

Question

Quizplus · Accepted Answer

The number of neutrons in an atom is calculated by subtracting the atomic number (which represents the number of protons) from the mass number. Therefore, the correct option is E, which is the mass number minus the atomic number.

The Number of Neutrons in an Atom Is Equal to