Why the electron gain enthalpy values of alkaline earth metals are lower (i.e. less negative) or positive?

Explanation

To understand why the electron gain enthalpy values of alkaline earth metals are lower (less negative) or even positive, we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Definition of Electron Gain Enthalpy**:
- Electron gain enthalpy is the amount of energy released when an electron is added to a neutral atom in the gas phase. This process is typically exothermic, meaning it releases energy, and is represented by negative values.

**Hint**: Remember that more negative values indicate a greater tendency to accept an electron.
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