Electron gain enthalpy of fluorine is less than that of chlorine. Why?

Explanation

To understand why the electron gain enthalpy of fluorine is less than that of chlorine, we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Understanding Electron Gain Enthalpy**:
- Electron gain enthalpy refers to the energy change when an electron is added to a neutral atom in the gas phase. A more negative value indicates a greater tendency to gain an electron.

2. **Position in the Periodic Table**:
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