If an element of atomic number 15 has an isotope of mass number 32
A) the number of protons in the nucleus is 17.
B) the number of neutrons in the nucleus is 15.
C) the number of protons in the nucleus is 32.
D) the number of nucleons in the nucleus is 15.
E) the number of neutrons in the nucleus is 17.

Question

Quizplus · Accepted Answer

The atomic number 15 indicates there are 15 protons. The mass number 32 means the total number of protons and neutrons is 32. Therefore, the number of neutrons is 32 - 15 = 17.

If an Element of Atomic Number 15 Has an Isotope