The correct order in which the first ionisati | vedclass

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(B) The first ionisation potential generally increases in a period from left to right and decreases in a group from top to bottom. Comparing the eleme

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$K, Na, Be$

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(B) The first ionisation potential generally increases in a period from left to right and decreases in a group from top to bottom. Comparing the elements: $K$ (Group $1$,Period $4$),$Na$ (Group $1$,Period $3$),and $Be$ (Group $2$,Period $2$). Since $K$ and $Na$ are in the same group,$IE_1$ of $K $Be$ is in Period $2$ and Group $2$,which has a higher $IE_1$ than elements in Group $1$ of the same or lower periods. Thus,the correct order of first ionisation potential is $K < Na < Be$.

List-$I$ (Electronic configuration)	List-$II$ ($\Delta_{i}H$ in $kJ\ mol^{-1}$)
$(a)$ $1s^{2} 2s^{2}$	$(i)$ $801$
$(b)$ $1s^{2} 2s^{2} 2p^{4}$	$(ii)$ $899$
$(c)$ $1s^{2} 2s^{2} 2p^{3}$	$(iii)$ $1314$
$(d)$ $1s^{2} 2s^{2} 2p^{1}$	$(iv)$ $1402$

The correct order in which the first ionisation potential increases is

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