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Trends in Ionization Energy

Which of the ...

Question

Which of the following species has lowest ionization enthalpy ?

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O_{2}

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O_{2}^{+}

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O_{2}^{-}

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Solution

The correct option is A O
$O_{2^{-}}$ has lower ionization energy than any other. Since it has contained more numbers of electrons in its molecular orbital hence the effective nuclear charge was decreased. So, it has low ionization energy.

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