Which of the following orders for ionisation | vedclass

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Question

(B) The general trend for ionisation energy $(IE)$ increases across a period from left to right due to an increase in effective nuclear charge. Howeve

Vedclass · Accepted Answer

$B < Be < C < O < N$

Vedclass · Answer

(B) The general trend for ionisation energy $(IE)$ increases across a period from left to right due to an increase in effective nuclear charge. However,there are exceptions due to stable electronic configurations. $Be$ $(1s^2 2s^2)$ has a fully filled $2s$ orbital,making its $IE$ higher than $B$ $(1s^2 2s^2 2p^1)$. $N$ $(1s^2 2s^2 2p^3)$ has a stable half-filled $p$-orbital,making its $IE$ higher than $O$ $(1s^2 2s^2 2p^4)$. Therefore,the correct order is $B < Be < C < O < N$.

Which of the following orders for ionisation energy is correct?

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