Per NCERT §3.6.3, d-block (transition) elements occupy which groups and have what general outer configuration?
AGroups 3–12; (n−1)d¹⁻¹⁰ ns⁰⁻² (except Pd which is 4d¹⁰5s⁰)
BGroups 1–2; ns¹⁻²
CLanthanoid panel only
DGroups 13–18; ns²np¹⁻⁶
Answer & Solution
Correct answer: A. Groups 3–12; (n−1)d¹⁻¹⁰ ns⁰⁻² (except Pd which is 4d¹⁰5s⁰)
Per NCERT §3.6.3, d-block = Groups 3–12, general (n−1)d¹⁻¹⁰ ns⁰⁻². Pd is exception (4d¹⁰5s⁰).
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