Question

The difference between electron gain enthalpies will be maximum between

• A. Ne and F
• B. Ne and Cl
• C. Ar and Cl
• D. Ar and F

Answer 1

The Correct Option is B

The question asks about the maximum difference in electron gain enthalpy between the given pairs of elements. To solve this, we need to understand the concept of electron gain enthalpy and how it varies across the periodic table.

Electron gain enthalpy is the enthalpy change when an electron is added to a neutral atom in the gaseous state to form a negative ion. It generally becomes more negative across a period (from left to right) and less negative down a group (from top to bottom).

1. Among the given options, Ne (Neon) and Cl (Chlorine) are elements in Group 18 and Group 17 of the Periodic Table, respectively.
2. Neon is a noble gas with a completely filled outer shell, making its electron gain enthalpy positive, as it is not energetically favorable to add an electron.
3. Chlorine, on the other hand, has a high affinity for additional electrons and thereby has a highly negative electron gain enthalpy.
4. Comparing Ne with F, although F also has a negative electron gain enthalpy, the difference is not as pronounced because both F and Cl have negative values, but Cl has a slightly more negative value than F.
5. Comparing Ne with Cl takes into account both elements with extreme ends of electron affinity scales; Ne with a positive and Cl with a negative enthalpy value, ensuring a large difference.
6. Similarly, Ar (Argon) paired with either Cl or F would not surpass the difference observed between Ne and Cl. Both Ne and Ar are noble gases, but Ne is higher in the group, suggesting a similar but less extreme case than Ar.

After analyzing the characteristics and trends of electron gain enthalpy, we conclude that the maximum difference will be observed between Ne and Cl.