Question

How many electrons are in the ion, P3-?

A
18
B
28
C
12
D
34

Answer 1

Answer: 18

Step-by-step explanation:

The atomic number of P is 15, and the charge of -3 indicates that it has 3 more electrons than protons.

There are 15 protons (since atomic number = number of protons), so there are 15 + 3 = 18 electrons.