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What will be the order of first ionisation energy?A. `LigtNagtK`B. `KgtLigtNa`C. `NagtLigtK`D. `LigtKgtNa`

Answer» Correct Answer - A
In a group, the ionisation potential decreases from top to bottom. In the alkali group, the ionisation potential decreases from Li to Cs.
`{:(,Li,Na,K,Rb,Cs),(eV,5.3,5.1,4.3,4.2,3.9):}`


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