Question

The IP of Zr is 674 kJ/mole. The IP of $H_f$ is

• A. 656 kJ
• B. 760 kJ
• C. 616 kJ
• D. 631 kJ

Answer 1

The correct option is B 760 kJ

Down the group the ionisation potential of Hafnium (Hf) increases as the nuclear charge increases but the d and f orbitals doesn't shield good, increasing nuclear charge increases the hold on valence electrons.