1.

The ionisation potential order for which set is correct ?

Answer»

`CS lt Li lt K`
`Cs gt Li gt B`
`Li gt K gt Cs`
`B gt Li gt K`

SOLUTION :While moving down in a GROUP, EFFECTIVE nuclear attraction decreases due to addition of new orbits. As a RESULT ionisation potential decreases. Hence, the correct order is `LigtKgtCs.`


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