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Correct order of first ionisation potentials

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K < Na

Ca < K

Mg < Ca

Be < Li

answer is A.

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Detailed Solution

K < Na,(IA group), down the group IE decreases.

Ca > K (4^th period), across a period IE increases.

Mg > Ca (IIA group), down the group IE decreases.

Be > Li (2^nd period), across a period IE increases.

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