question_answer

The element scandium (Z = 21) does not exhibit variable oxidation states and yet it is regarded as a transition element. Explain

Answer:

                  The electronic configuration of Sc (Z = 21); \[Sc(Z=21):\,{{[Ar]}^{18}}\,4{{s}^{2}}\,3{{d}^{1}}\]. The element exhibits +3 oxidation state in its compounds because by losing the three electrons, it acquires a noble gas configuration. However, it is still regarded as a transition element because it has a partially filled d sub-shell.