Question

The K shell can accommodate _______ electrons whereas L can accommodate ________ electrons.

• A. 2
• B. 8

Answer 1

• According to Bohr’s Atomic model electrons revolve around the nucleus in a specific circular path known as orbit or called a shell.
• Shells have stationary energy levels, the energy of each shell is constant.
• These shells are called energy levels. It is numbered as $1,2,3,4....$or $\mathrm{K},\mathrm{L},\mathrm{M},\mathrm{N}......$from the nucleus outwards.

The value of ‘n’	Designation of shell
$1$	$\mathrm{K}$
$2$	$\mathrm{L}$
$3$	$\mathrm{M}$
$4$	$\mathrm{N}$
$5$	$\mathrm{O}$

• The maximum number of electrons present in a shell is given by the formula 2n², where ‘$\mathrm{n}$’ represents the shell number.

1. First orbit or $\mathrm{K}$-shell ($\mathrm{n}=1$) =
$2\times 1^2$$=2$
2. Second orbit or $\mathrm{L}$-shell ($\mathrm{n}=2$) =
$2\times 2^2=8$
and so on.

Therefore, the K shell can accommodate 2 electrons whereas L can accommodate 8 electrons.