Question

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

• A. $Cu$ and $Cr$
• B. $Cu$ and $Se$
• C. $Cu$ and $Zn$
• D. $Sc$ and $Zn$

Answer 1

Answer: (D)

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