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Ionization energy is highest for :

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$F$

${Cl}^{-}$

${Be}^{-}$

$S^{-}$

answer is A.

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Detailed Solution

Ionization energy is highest for fluorine.

Fluorine has the highest ionization energy because it has a tendency to gain an electron rather than losing an electron, since it has 7 electrons in the outermost shell.

Therefor, option A is correct.

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