Question

The maximum number of electrons in any shell is given by____ rule.

• A. 2n
• B. $n^2$
• C. $2n^2$
• D. $4n^2$

Answer 1

The correct option is C $2n^2$

Maximum no of electrons in a shell $={2n}^2$

this is called ${2n}^2$rule

for example,second shell $\Rightarrow n=2$

to ${2n}^2$rule,no of electrons in $2^{nd}$ shell=$2{\left(2\right)}^2$=8