Question

What is the maximum number of electrons in the 5th energy level?

• A. $72$
• B. $18$
• C. $32$
• D. $50$

Answer 1

The correct option is D $50$

Mass number of electrons$=2n^2....n$ is energy level.

$\therefore$Mass number of electrons in $5^{th}$ energy level$=2{\left(5\right)}^2$

$=2\left(25\right)=50$