The coordination number of a central metal atom in a complex(s) is//are not determined by

Options

A. a.The number of anionic ligands bonded to the metal ion
B. b.The number of ligands around metal ion bonded by pi-bonds
C. c.The number of ligands around a metal ion bonded by both pi and o-bonds
D. d.The number of ligands around a metal ion bonded by o-bonds

Answer

To determine which statements do not influence the coordination number of a central metal atom in a complex, we need to understand what factors typically determine coordination number. Here’s a step-by-step solution:

### Step 1: Define Coordination Number
The coordination number (CN) of a central metal atom in a coordination complex is defined as the number of ligand donor atoms that are bonded to the central metal atom. It is primarily determined by the number of sigma bonds formed between the metal and the ligands.

**Hint:** Remember that coordination number is related to the number of bonds formed with ligands.

### Step 2: Identify Factors Affecting Coordination Number
The coordination number can be influenced by several factors including:
- The size of the central metal atom.
- The size and charge of the ligands.
- The electronic configuration of the metal.
- The geometry of the complex.

**Hint:** Think about how the physical and chemical properties of the metal and ligands can affect bonding.

### Step 3: Analyze the Statements
Now, we need to analyze the given options (A, B, C) to see which do not determine the coordination number:
- **Option A:** Typically relates to the nature of the ligand.
- **Option B:** Might refer to the charge of the metal.
- **Option C:** Could involve the geometry of the complex.

If all these options relate to factors that influence the bonding and thus the coordination number, they cannot be considered as factors that do not determine the coordination number.

**Hint:** Look for options that do not directly relate to the bonding or structural aspects of the complex.

### Step 4: Conclusion
Based on the analysis, options A, B, and C are all factors that can influence the coordination number. Therefore, the correct answer to the question "The coordination number of a central metal atom in a complex(s) is not determined by" would be that none of these options (A, B, C) are correct in the context of determining the coordination number.

**Final Answer:** A, B, and C are not determinants of the coordination number.