Which of the following pairs of elements would have more negative electron gain enthalpy.

Options

A. N or O
B. F or Cl
C. S or O
D. C or Si

Explanation

To determine which pair of elements has more negative electron gain enthalpy, we need to analyze the electron affinity of the given elements.

### Step-by-Step Solution:

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

2. **Trend of Electron Affinity**:
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