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Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryClassification of Elements and Periodicity in Properties1 Mark
Question
Among Li, Na, K, Rb, Cs, which element has lowest ionisation energy and why?
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Answer

Cs has lowest ionisation energy due to largest atomic size and least effective nuclear charge.

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