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  4. Which has lowest and highest first ionization enthalpy in 3d series?

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Q. Which has lowest and highest first ionization enthalpy in $3d$ series?

The d-and f-Block Elements

Solution:

$Sc (3d^{1} 4s^{2})$ has $631 \,kJ\,\, mol^{-1}$ and $Zn (3d^{10}4s^{2})$ has $906$ kJ mol$^{-1}$