Question

Would you expect the second electron gain enthalpy of oxygen is positive, more
negative or less negative than the first? Justify your answer.

Answer 1

Answer:

Thus, the first electron gain enthalpy of O is negative. But when another electron is added to Oө to form O2- ion, energy is absorbed to overcome the strong electrostatic repulsion between the negatively charged Oө ion and the second electron being added. Thus,the second electron gain enthalpy of oxygen is positive.

Answer 2

Explanation:

Thus, the first electron gain enthalpy of O is negative. But when another electron is added to Oө to form O2- ion, energy is absorbed to overcome the strong electrostatic repulsion between the negatively charged Oө ion and the second electron being added. Thus,the second electron gain enthalpy of oxygen is positive.