Which of the following elements has most positive electron gain enthalpy ? Fluorine nitrogen neon.

Explanation

To determine which of the elements (Fluorine, Nitrogen, or Neon) has the most positive electron gain enthalpy, we can analyze the stability of their electronic configurations and how they interact with additional electrons.

### 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 gaseous atom. A more positive value indicates that the atom is less favorable in gaining an electron, meaning it is more stable in its current state.

2. **Analyze the Electronic Configurations:**
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