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  4. Correct order of 1st ionisation potential (IP) among following elements Be, B, C, N, O is

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Q. Correct order of 1st ionisation potential (IP) among following elements $Be, B, C, N, O$ is

AIPMTAIPMT 2001Classification of Elements and Periodicity in Properties

Solution:

The $1^\text{st}$ Ionisation Potential increases across a period as atomic size decreases. Given elements are $Be,B, C, N, O$. $1^\text{st}$ Ionisation Potential order is $B< Be< C< O< N.$