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Question

(B) Ionisation enthalpy increases across a period from left to right. However,electronic configuration plays a crucial role in stability. $p^3$ config

Vedclass · Accepted Answer

$[Ne] 3s^2 3p^3$

Vedclass · Answer

(B) Ionisation enthalpy increases across a period from left to right. However,electronic configuration plays a crucial role in stability. $p^3$ configuration represents a half-filled subshell,which provides extra stability due to symmetrical distribution of electrons and high exchange energy. Therefore,the element with the $[Ne] 3s^2 3p^3$ configuration has a higher first ionisation enthalpy than the elements with $p^2$ or $p^4$ configurations.

The electronic configuration which is associated with the highest first ionisation enthalpy is:

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