Write general electronic configuration of 3d series elements.(b) Write any two points which explain about the colour of a transition metal ion.

Q.9

(a) Write general electronic configuration of 3d series elements.

(b) Write any two points which explain about the colour of a transition metal ion.

Doubtly Asked 28 Oct 2026 Board exam · June 2026 hsc 12th Save WhatsApp Report

1 answer

Best answer

Answer:

(a) [Ar] 3d^1–10 4s^1–2 (in general, (n–1)d^1–10 ns^1–2).

(b)

Transition metal ions with partly filled d orbitals (unpaired d electrons) are coloured: in the presence of ligands the d orbitals split, and an electron absorbs visible light to jump from a lower to a higher d level (d–d transition).
The colour seen is the complementary colour of the light absorbed; ions with d⁰ (Sc³⁺, Ti⁴⁺) or d¹⁰ (Zn²⁺, Cu⁺) configuration have no d–d transition and are colourless. The colour also depends on the nature of the ligands.

Doubtly AI · 28 Oct 2026 AI-verified · Oct 2026 Report

Was this answer helpful?