Question

IP value of $Zr$ and $Hf$ are in the order :

• A. Zr > Hf
• B. Zr < Hf
• C. Zr = Hf
• D. Zr >= Hf

Answer 1

The correct option is B Zr < Hf

Due to weak shielding of f-orbital, $Hf$ has higher IP than $Zr$.