Which of the following elements has maximum first ionization potential?

1s²2s²2p¹

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1s²2s²2p³

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1s²2s²2p²

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1s²2s²2p⁴

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Solution

The correct option is B
1s²2s²2p³

$1 s^{2} 2 s^{2} 2 p^{3}$

Half-filled electronic configurations are more stable than configurations which are not half-filled.
Of course, fully-filled ones are the most stable.

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