Which of the following element has maximum first ionisation potential?

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Solution

The correct option is A Mn
Mn has maximum first ionisation potential due to stable half filled d-orbitals. Electronic configuration of $M n$ is $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{5}$ .

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