Statement - I :Scandium is the lightest transition metal.
Statement - II :Atomic radius of scandium is largest among all the transition elements

Scandium (Sc) is the lightest transition element. It is the first element in the 3d transition series. Among the transition elements, Sc has the lowest density.

The order of sizes of d-block elements are, 3d-series<4d-series$\approx$5d-series.