The number of unpaired electrons in nickel carbonyl, is

Options

A. zero
B. one
C. four
D. five

Explanation

To determine the number of unpaired electrons in nickel carbonyl (Ni(CO)₄), we can follow these steps:

### Step 1: Determine the Electron Configuration of Nickel
Nickel (Ni) has an atomic number of 28. Its electron configuration is:
- \( \text{Ni: } [\text{Ar}] 3d^8 4s^2 \)

### Step 2: Identify the Nature of the Ligand
Carbon monoxide (CO) is a strong field ligand. Strong field ligands are known to cause pairing of electrons in the d-orbitals.
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