Select from each group the species which has the smallest radius stating appropriate reason
Si, P, Cl

Explanation

To determine which species among Si (Silicon), P (Phosphorus), and Cl (Chlorine) has the smallest atomic radius, we can follow these steps:

### Step 1: Understand the Position in the Periodic Table
- Silicon (Si) is in Group 14 and Period 3.
- Phosphorus (P) is in Group 15 and Period 3.
- Chlorine (Cl) is in Group 17 and Period 3.

### Step 2: Compare the Elements
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