Sc (Z=21) is a transition element but Zinc (Z=30) is not because

Options

A. both `Sc^(3+)` and `Zn^(2+)` ions are colourless and form white compounds
B. In case of Sc, 3d orbital are partially filled but in Zn these are completely filled
C. last electron as assumed to be added to 4s level in case of zinc
D. both Sc and Zn do not exhibit variable oxidation states

Answer

B