alleryd-block elements have differentiating electrons in:
Ap-orbital
Bd-orbital (groups 3-12)
Cs-orbital
Df-orbital
Answer & Solution
Correct answer: B. d-orbital (groups 3-12)
d-block: groups 3-12. d-electron is the differentiating one.
Includes Sc, Ti, V, Cr, Mn, Fe, ..., Cu, Zn, etc. Transition metals (technically d¹-d⁹, so Sc-Cu).
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