GKFix MCQ Question

What is the primary reason Scandium (Sc) shows only +3 as its stable oxidation state?

• A. It gains 1 electron to complete its d-subshell.
• B. It loses 2 electrons from the 4s orbital.
• C. It loses its 3 outermost electrons (2 from 4s and 1 from 3d) to achieve the stable, noble gas configuration of Argon.
• D. It forms covalent bonds exclusively.