Pair of transition elements which show abnormal electronic configuration in the first 3d-series are:
Correct answer: C. Cr and Cu
- A. Cr and Ni
- B. Fe and Ni
- C. Cr and Cu
- D. Cu and Co
Explanation
The correct option is C) Cr and Cu. Both Chromium (Cr) and Copper (Cu) are transition elements that show abnormal electronic configurations in the first 3d-series. Chromium has an electronic configuration of [Ar] 3d^5 4s^1, and Copper has an electronic configuration of [Ar] 3d^10 4s^1.
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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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