Coordination number of the transition element in [Pt Cl NO2 (NH3)4]2- is____________________?
Correct answer: B. 6
- A. 2
- B. 6
- C. 4
- D. 8
Explanation
The coordination number is the number of donor atoms directly bonded to platinum. In [PtClNO2(NH3)4]2-, there is 1 Cl ligand + 1 NO2 ligand + 4 NH3 ligands = 6 donor atoms, so the coordination number is 6. The likely mistake is choosing 4 by counting only the NH3 ligands and ignoring Cl and NO2.
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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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