Phosphorus Has an Atomic Number of 15 and an Atomic

Question

Phosphorus has an atomic number of 15 and an atomic mass of 31.How many neutrons does it have?
A) 5
B) 16
C) 30
D) 31
E) 47

Accepted Answer

The number of neutrons can be found by subtracting the atomic number from the atomic mass. So, 31 - 15 = 16 neutrons. Thus, B is the correct answer.