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Question

Which ionisation energy of alkaline earth metal is less than that of alkali metals?

A
Third
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B
Second
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C
First
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D
Fourth
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Solution

The correct option is B Second
The second ionisation energy of alkaline earth metal is less than that of alkali earth metals.
The 2nd electron in case of alkali metal is to be removed from a cation (unipostive ion) which has already acquired a noble gas configuration whereas, in case of alkaline earth metals, the second electron is to be removed from a cation which is yet to acquire the stable noble gas configuration. Therefore, removal of 2nd electron in case of alkaline earth metals requires much less energy than that in the case of alkali metals.

Hence, the correct option is B

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