In halogens (group 17) the atomic radius of chlorine is greater than the atomic radius of fluorine. Give reason.

Explanation

To understand why the atomic radius of chlorine is greater than that of fluorine in the halogens (Group 17), we can break down the explanation into several steps:

### Step 1: Identify the Elements
Fluorine (F) and chlorine (Cl) are both members of Group 17 (the halogens). Fluorine has an atomic number of 9, while chlorine has an atomic number of 17.

### Step 2: Electron Configuration
- Fluorine has an electron configuration of 1s² 2s² 2p⁵, which means it has 2 electron shells.
- Chlorine has an electron configuration of 1s² 2s² 2p⁶ 3s² 3p⁵, indicating that it has 3 electron shells.
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