Question

Assertion: K, L, M, N orbits can accommodate maximum of 2, 8, 18, 32 electrons respectively.

Reason: The maximum number of electrons in particular orbit is given by $2n^2$, where $n$ is orbit or shell number.

• A. Assertion is true, but reason is false.
• B. Assertion is false, but reason is true.
• C. Both assertion and reason are true.
• D. Both assertion and reason are false.

Answer 1

The correct option is C Both assertion and reason are true.

The maximum number of electrons that can be accommodated in any shell according to Bohr and Bury is $2$$n^2$ where $n$ is the shell number.

Shell	Maximum no. of electrons
K, n=1	$2$ $\times$ $1^2$ = 2
L, n=2	$2$ $\times$ $2^2$ = $8$
M, n=3	$2$ $\times$ $3^2$ = $18$
N, n=4	$2$ $\times$ $4^2$= $32$

Hence, both assertion and reason are correct.