The coordination number of the central metal ion in a complex is
Correct answer: C. the number of dative bonds formed between the ligands and the metal ion
- A. the charge on the complex ion
- B. the number of ligands in the solution
- C. the number of dative bonds formed between the ligands and the metal ion
- D. the oxidation state of the metal
Explanation
Coordination number counts the bonds to the central ion, so it is six in the octahedral hexaaquairon complex and four in the tetrahedral tetrachlorocuprate ion. It is not the same as the oxidation state, which counts the charge the metal would carry if the ligands were removed with their electron pairs. A single bidentate ligand such as ethylenediamine contributes two to the coordination number.
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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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