2025 · Q107
Which one of the following general electronic configurations correctly represent transition metal element?
General KnowledgeChemistry
- A(n – 2) d1–10 ns2
- B(n – 2) f1–14 (n – 1) d0–1 ns2
- Cns2 np6 nd1–10
- D(n − 1) d1–10 ns0–2
Explanation
Transition metals are characterised by incompletely filled d-orbitals, with the general outer electronic configuration (n−1)d1–10 ns0–2 (commonly ns1–2). The f-block (inner transition) elements instead fill (n−2)f orbitals, so option B describes lanthanides/actinides, not transition metals. This incomplete d-subshell gives transition metals their characteristic colours and catalytic activity.