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Ionisation energy in group 1A varies in the decreasing order as 

(a) Li > Na > K > Cs 

(b) Na > Li > K >Cs 

(c) Li > Cs > K > Na 

(d) K > Cs > Na > Li

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Ionisation energy in group 1A varies in the decreasing order as 

(a) Li > Na > K > Cs 

(b) Na > Li > K >Cs 

(c) Li > Cs > K > Na 

(d) K > Cs > Na > Li

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nan