Although fluorine is more electronegative than oxygen, but the ability of oxygen to stabilize higher oxidation states exceeds that of fluorine. Why ?

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In a transition series, as the atomic number increases, paramagnetism

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  • [AIPMT 1990]

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(Given atomic number: $\mathrm{Sc}: 21, \mathrm{Ti}: 22, \mathrm{~V}: 23$, $\mathrm{Cr}: 24, \mathrm{Mn}: 25, \mathrm{Fe}: 26, \mathrm{Co}: 27, \mathrm{Ni}: 28, \mathrm{Cu}: 29$, $\mathrm{Zn}: 30)$

  • [JEE MAIN 2024]

Which of the comparison regarding $Zn,\,Cd,\,Hg$ is/are incorrect ?

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$(IV)$ all from $A_2^{2+}$ type ion