Electron affinity of grou -16 elements varies as

Options

A. `O gt S gt Se gt Te`
B. `O lt S lt Se lt Te`
C. `S gtOgtSegtTe`
D. `SegtOgtSgtTe`

Explanation

To determine how the electron affinity of Group 16 elements varies, we will analyze the elements in this group and their respective trends.

### Step-by-Step Solution:

1. **Identify Group 16 Elements**:
The elements in Group 16 of the periodic table are:
- Oxygen (O)
- Sulfur (S)
- Selenium (Se)
- Tellurium (Te)
- Polonium (Po)

2. **Understand the General Trend**:
Generally, as we move down a group in the periodic table, the atomic radius increases. This increase in atomic size typically leads to a decrease in electron affinity because the added electron is further from the nucleus and experiences less attraction.

3. **Predict Electron Affinity Trend**:
Based on the general trend, we might initially predict the order of electron affinity to be:
- O > S > Se > Te > Po
However, this prediction does not hold true for oxygen.

4. **Analyze Oxygen's Electron Affinity**:
Oxygen has a small atomic size, which leads to significant inter-electronic repulsions among its valence electrons. The presence of these repulsions makes it less favorable for oxygen to gain an additional electron, as the incoming electron would experience repulsion from the already present valence electrons.

5. **Revised Order of Electron Affinity**:
Due to the reasons stated above, the correct order of electron affinity in Group 16 is:
- S > Se > Te > Po > O

6. **Conclusion**:
Therefore, the electron affinity of Group 16 elements varies as follows:
- Sulfur has the highest electron affinity, followed by selenium, tellurium, polonium, and finally, oxygen has the lowest electron affinity due to the repulsion among its valence electrons.

### Final Order of Electron Affinity:
- **S > Se > Te > Po > O**