Q.

Among the naturally occuring elements, the element with least IP1 is

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a

Cs

b

Ba

c

Be

d

Li

answer is A.

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Detailed Solution

Alkali metals….only one valence electron and large atomic radius….least IP1 ;IP1 of Li > Na > K > Rb > Cs ;
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Among the naturally occuring elements, the element with least IP1 is