Question

How many electrons are in the third energy level?

a) 2
b) 8
c) 18
d) 20

Answer 1

The maximum number of electrons in the third energy level is 18.

Step-by-step explanation:

The maximum number of electrons in the third energy level is 18.

According to the equation "maximum number of electrons that can be in a shell = 2n²", the maximum number of electrons in the n = 3 shell is 2(3)² = 2(9) = 18.