Which of the following elements never has an oxidation state +1?

Options

A. F
B. Cl
C. Br
D. I

Explanation

To determine which of the following elements never has an oxidation state of +1, we can analyze the oxidation states of the elements provided.

### Step-by-Step Solution:

1. **Understanding Oxidation States**:
- The oxidation state (or oxidation number) indicates the degree of oxidation of an atom in a compound. A positive oxidation state means the element has lost electrons, while a negative oxidation state indicates it has gained electrons.

2. **Identifying the Elements**:
- The question likely refers to elements from the halogen group: Fluorine (F), Chlorine (Cl), Bromine (Br), and Iodine (I).

3. **Analyzing the Halogens**:
- Halogens are known for having high electronegativity, which influences their oxidation states.
- **Fluorine (F)**: It has the highest electronegativity (4.0) and always exhibits an oxidation state of -1 in compounds. It never shows a +1 oxidation state.
- **Chlorine (Cl)**: Can have oxidation states of -1, +1, +3, +5, and +7.
- **Bromine (Br)**: Can also exhibit oxidation states of -1, +1, +3, +5, and +7.
- **Iodine (I)**: Similar to bromine, it can have oxidation states of -1, +1, +3, +5, and +7.

4. **Conclusion**:
- Among the halogens, only Fluorine does not exhibit a +1 oxidation state. Therefore, the answer to the question is Fluorine.

### Final Answer:
Fluorine (F) never has an oxidation state of +1.