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JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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Which one of the following elements has the highest ionisation energy?

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Correct option: B

\left[ {\mathrm{Ne}} \right]3{s^2}3{p^3}

Option B ([Ne]3s²3p³) is correct because the half-filled p-orbital configuration ([Ne]3s²3p³) provides extra stability, making it more difficult to remove an electron, thus resulting in the highest ionization energy.

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