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Configuration of the element with the highest ionisation energy is

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[Ne] 3s² 3p⁴

[Ne] 3d¹⁰ 4s²4p³

[Ne]3s¹

[Ne] 3s² 3p³

answer is B.

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Detailed Solution

As [Ne] 3s² 3p³ is half filled, and thus it has stable configuration.

So, it is difficult to remove the outermost electron.

Hence, option (B) is correct.

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