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  4. Correct order of first ionization potential among the following elements Be, B, C, N, O is

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Q. Correct order of first ionization potential among the following elements $Be, B, C, N, O$ is

J & K CETJ & K CET 2003

Solution:

The ionisation potential increases from left to right in a period but -the first ionisation potential of nitrogen is greater than oxygen due to half-filled stable configuration and ionisation potential of $Be$ is greater than $B$ due to completely filled s-orbital. Hence, the order of ionisation potential is as:
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