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 $K < Na < Be$.

The correct order in which the first ionisation potential increases is

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