Colour in transition metal compounds is attributed to____________?
Correct answer: D. Incomplete (n-1) d sub-shell
- A. Small sized metal ions
- B. Absorption of light in UV region
- C. Complete ns sub-shell
- D. Incomplete (n-1) d sub-shell
Explanation
In many transition-metal ions, an incomplete (n-1)d subshell allows electrons to absorb visible light and move between split d energy levels, producing the complementary colour. The likely mistake is option b, because the relevant absorption is usually in the visible region rather than only the ultraviolet region.
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About Electronic Structure of d-Block Elements
The electronic structure of d-block elements covers the filling of the (n-1)d and ns orbitals, general electronic configurations, and the exceptions shown by chromium and copper. It explains how partially filled d orbitals produce variable oxidation states, coloured ions, magnetic behaviour and complex formation, while distinguishing transition elements from elements with completely filled d subshells.
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