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Among Li, Na, K, Cs, the element with the highest first ionisation enthalpy is:
ALi, since IE generally decreases down the alkali group
BNa, since sodium is the median element of the group
CK, since potassium has a larger nucleus than Cs above
DCs, since Cs has the smallest radius of the four atoms
Answer & Solution
Correct answer: A. Li, since IE generally decreases down the alkali group
IE decreases down group 1; Li is at the top, with the highest IE.
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