Question

would
Q2. Which of the following pairs of elements would have a more negative electron gain enthalpy. Explain
(a)O or S
(b) O or F
(c) F or Cl​

Answer 1

Answer:

b) O or F

Explanation:

O or F. Electron gain enthaply of F is much more negative than that of O. This is because as we from O to F, the atomic size decreases and nuclear charge increases, thereby increase the attraction of the nucleus for the incoming electron and hence electron gain enthaply becomes more negative.