GKFix MCQ Question

In the series Sc (Z = 21) to Zn (Z = 30), why is the enthalpy of atomisation of zinc the lowest?

• A. Zinc has the highest nuclear charge
• B. Zinc has a completely filled 3d subshell, resulting in weaker metallic bonding
• C. Zinc has the largest atomic radius
• D. Zinc forms only ionic bonds