What will be the order of first ionisation energy ?
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a
Li > Na > K
b
K > Li > Na
c
Na > Li > K
d
Li > K > Na
answer is A.
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Detailed Solution
In a group, the ionization potential decreases from top to bottom. In the alkali group, the ionization potential decreases from Li to Cs. Li Na K Rb CseV 5.3 5.1 4.3 4.2 3.9