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Question

Ionisation enthalpy in the alkali group:

A
increases from Li to Cs
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B
decreases from Li to Cs
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C
remains the same
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D
bears no gradation
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Solution

The correct option is B decreases from Li to Cs
Answer B
When the atomic radius is increasing with the period, the distance between the last electron which is loosely attached to the nucleus and nucleus increases. So the nucleus does not attract the last electron with a strong nuclear force. As a result, the ionization becomes easier and it needs less energy.

Hence the ionisation enthalpy decreases from Li to Cs.

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