Question

Read below given tabular form and answer the questions.

Element	Electronic configuration	Element	Electronic configuration
He	$1s^2$	Kr	$4s^{2}4p^6$
Ne	$2s^{2}2p^6$	Xe	$5s^{2}5p^6$
Ar	$3s^{2}3p^6$	Rn	$6s^{2}6p^6$

Write name of $5^{th}$ period element?

Answer 1

$He\to 1s^2$ ($1^{st}$ period)

$Kr\to 4s^{2}4p^6$ ($4^{th}$ period)

$Ne\to 2s^{2}2p^6$ ($2^{nd}$ period)

$Xe\to 5s^{2}5p^6$ ($5^{th}$ period)

$Ar\to 3s^{2}3p^6$ ($3^{rd}$ period)

$Rn\to 6s^{2}6p^2$ ($6^{th}$ period)

$Xe$ is the $5^{th}$ period element.