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Trend in Ionisation Enthalpy

Question

Which element is a noble gases?
$R$
$P$
$S$
$T$

A

T

B

R

C

S

D

P

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Solution

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Noble gases have a stable full-filled configuration. It is not easy to remove an electron from such a configuration. Thus in a particular period, noble gases have maximum first ionisation energy.

' $T$ ' has maximum first ionisation energy from other given elements so it represents a noble gas.

Hence, option B is correct.

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