How many electrons in the `Cl^(-)` ion have value of m=0?

Explanation

To determine how many electrons in the `Cl^(-)` ion have a magnetic quantum number (m) equal to 0, we will follow these steps:

### Step 1: Determine the electron configuration of `Cl^(-)`
Chlorine (Cl) has an atomic number of 17, meaning it has 17 electrons. When it gains an electron to form `Cl^(-)`, it has a total of 18 electrons. The electron configuration for `Cl^(-)` is:
- 1s² 2s² 2p⁶ 3s² 3p⁶

### Step 2: Identify the subshells and their quantum numbers
Next, we need to identify the subshells and their corresponding quantum numbers:
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