Chemistry - Complete d-block Question with Solution | TestHub

Scandium (Sc, atomic number 21) is the transition element that does not exhibit variable oxidation states. Its ground-state electronic configuration is $[Ar]3d^{1}4s^2$. It achieves a stable, noble-gas electronic configuration by losing all three of its valence electrons. Consequently, it exclusively shows a single oxidation state of $+3$ in its compounds. Therefore, the correct option is (B).