How many unpaired electrons are present in the ground state of (i) `P(Z = 15)` (ii) `Fe^(2+) (Z = 26) ` (iii) `Cl^(-)(Z = 17)` ?

Explanation

To determine the number of unpaired electrons in the ground state of the given elements and ions, we will follow these steps:

### Step 1: Determine the Electron Configuration

**(i) For Phosphorus (P, Z = 15)**

1. The atomic number of phosphorus is 15, which means it has 15 electrons.
2. The electron configuration can be written as:
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