What is the electronegativity value on pauling scale of the halogen that does not under…..proportionation.

Answer

To solve the question regarding the electronegativity value on the Pauling scale of the halogen that does not undergo disproportionation, we can follow these steps:

### Step 1: Understand Disproportionation Reaction
A disproportionation reaction is a type of redox reaction where a single substance is both oxidized and reduced, resulting in two different products with different oxidation states.

**Hint:** Remember that disproportionation involves a change in oxidation states of the same element.

### Step 2: Identify Halogens
The halogens include fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).

**Hint:** List out the halogens to keep track of their properties.

### Step 3: Determine Oxidation States of Halogens
- Fluorine has only one oxidation state: -1.
- Chlorine, bromine, and iodine can have multiple oxidation states (e.g., -1, +1, +3, +5, +7).

**Hint:** Focus on the oxidation states of each halogen to identify which one has only one.

### Step 4: Identify the Halogen That Does Not Undergo Disproportionation
Since fluorine is the only halogen that has a single oxidation state (-1), it does not undergo disproportionation. The other halogens can exist in multiple oxidation states and can participate in disproportionation reactions.

**Hint:** Recall that the halogen with only one oxidation state cannot undergo disproportionation.

### Step 5: Find the Electronegativity Value of Fluorine
On the Pauling scale, the electronegativity value of fluorine is 4.0, which is the highest value among all elements.

**Hint:** Remember that electronegativity values can be found in reference materials or periodic tables.

### Conclusion
The electronegativity value on the Pauling scale of the halogen that does not undergo disproportionation is **4.0** for fluorine.

**Final Answer:** 4.0

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