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The correct order of negative electron g...

The correct order of negative electron gain enthalpy of halogens is

A

`gtCl ltBr gtI`

B

`IgtBrgtClgtF`

C

`BrgtIgtFgtCl`

D

`ClgtFgtBrgtI`

Text Solution

AI Generated Solution

The correct Answer is:
To determine the correct order of negative electron gain enthalpy of halogens, we need to understand the concept of electron gain enthalpy and how it varies among the halogens (Fluorine, Chlorine, Bromine, and Iodine). ### Step-by-Step Solution: 1. **Define Electron Gain Enthalpy**: - Electron gain enthalpy is defined as the amount of energy released when an electron is added to a neutral gaseous atom to form a negative ion. It is usually expressed in kilojoules per mole (kJ/mol). The more negative the value, the more energy is released, indicating a stronger tendency to gain an electron. 2. **Identify the Halogens**: - The halogens are a group of elements in Group 17 of the periodic table: Fluorine (F), Chlorine (Cl), Bromine (Br), and Iodine (I). 3. **Analyze Electron Gain Enthalpy Trends**: - As we move down the group from Fluorine to Iodine, the atomic size increases, which affects the electron gain enthalpy. - Fluorine has a very high electronegativity and a small atomic radius, which allows it to attract an additional electron strongly, resulting in a highly negative electron gain enthalpy. - Chlorine, being larger than Fluorine, has a slightly less negative electron gain enthalpy than Fluorine but is still quite negative. - Bromine has a less negative electron gain enthalpy than Chlorine due to its larger size and lower electronegativity. - Iodine has the least negative electron gain enthalpy among the halogens due to its larger atomic size and lower electronegativity compared to the other halogens. 4. **Order the Halogens Based on Electron Gain Enthalpy**: - Based on the above analysis, the order of negative electron gain enthalpy for halogens from most negative to least negative is: - **Cl > F > Br > I** 5. **Conclusion**: - Therefore, the correct order of negative electron gain enthalpy of halogens is: - **Cl (Chlorine) > F (Fluorine) > Br (Bromine) > I (Iodine)**.
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