In the complex [Cr(OH)3(H2O)3] the coordination number is __________________?
Correct answer: D. 6
- A. 2
- B. 3
- C. 4
- D. 6
Explanation
Coordination number counts the donor atoms directly bonded to the central metal ion. In [Cr(OH)3(H2O)3], three hydroxide ions and three water molecules each donate through one atom, so the coordination number is 3 + 3 = 6. Students may answer 3 by counting ligand types or only one set of ligands instead of all six donor atoms.
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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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