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Why the first ionisation energy of carbo...

Why the first ionisation energy of carbon atom is greater than that of boron atom whereas, the reverse is true for the second ionisation energy.

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Stability of complete filled `B^(+)`
The first ionization energy of carbon is greater than the same of boron as predicted from periodic trend. However, for 2nd ionization trend is reversed due to stability of completely filled 2s-orbital of `B^(+)`
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