The correct order of electron affinity of the elements of oxygen family in the periodic table is

Options

A. `OgtSgtSe`
B. `SgtOgtSe`
C. `SgtSegtO`
D. `SegtOgtS`

Explanation

To determine the correct order of electron affinity of the elements in the oxygen family (Group 16) of the periodic table, we will analyze the elements: oxygen (O), sulfur (S), and selenium (Se).

### Step-by-Step Solution:

1. **Understanding Electron Affinity**:
- Electron affinity is the amount of energy released when an electron is added to a neutral atom in the gas phase. A higher electron affinity means that the atom more readily accepts an electron.

2. **Identifying the Elements**:
- The elements in the oxygen family include oxygen (O), sulfur (S), selenium (Se), and tellurium (Te). However, we will focus on O, S, and Se for this question.

3. **Trends in Electron Affinity**:
- Generally, electron affinity increases across a period (from left to right) and decreases down a group (from top to bottom) in the periodic table. This is due to the increasing atomic size and decreasing effective nuclear charge experienced by the added electron as you move down the group.

4. **Analyzing the Elements**:
- **Oxygen (O)**:
- Oxygen has a small atomic radius, leading to significant inter-electronic repulsion when an additional electron is added to its already occupied p-orbitals. This repulsion decreases its electron affinity.
- **Sulfur (S)**:
- Sulfur is larger than oxygen, so the added electron experiences less repulsion compared to oxygen, resulting in a higher electron affinity than oxygen.
- **Selenium (Se)**:
- Selenium is larger than sulfur, and while it has a lower electron affinity than sulfur, it is still greater than that of oxygen due to the same reasons mentioned above.

5. **Conclusion**:
- Based on the analysis, the order of electron affinity for the elements of the oxygen family is:
- **Sulfur (S) > Selenium (Se) > Oxygen (O)**

### Final Answer:
The correct order of electron affinity of the elements of the oxygen family is:
**S > Se > O**.