Question

The correct order of increasing electron affinity of the following elements is :

• A. O < S < F < Cl
• B. O < S < Cl < F
• C. S < O < F < Cl
• D. S < O < Cl < F

Answer 1

Answer: (A)

O < S < F < Cl

Answer 2

The electron affinity values approximately are:

$$EA(\text{O}) \approx 140\ \text{kJ/mol},\quad EA(\text{S}) \approx 200\ \text{kJ/mol},\quad EA(\text{F}) \approx 328\ \text{kJ/mol},\quad EA(\text{Cl}) \approx 349\ \text{kJ/mol}.$$

Thus, in increasing order:

$$\text{O} < \text{S} < \text{F} < \text{Cl}.$$