Question

The maximum number of electrons theoretically possible for a seventh principle quantum number is:

• A. $49$
• B. $196$
• C. $86$
• D. $98$

Answer 1

The correct option is D $98$

In general $n^{th}$ shell can hold $2n^2$ electrons.

$\therefore$ For $n=7,2n^2=2(7{)}^2$

$\Rightarrow 2\left(49\right)=98$ electrons

$\therefore$ Maximum number of electrons theoritically possible for $n=7=98$.