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  4. Which of the following has maximum ionisation potential?

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Q. Which of the following has maximum ionisation potential?

AIIMSAIIMS 1999Classification of Elements and Periodicity in Properties

Solution:

Alkali metals have lower ionisation potential than alkaline earth metals due to the extra nuclear charge in alkaline earth metals (which pulls e inwards). Also, $Mg$ has got lower ionisation potential than $Be$ as electron to be removed from $Mg$ is present in one. shell outwards than in Be.