Question

Which of the following will have the most negative electron gain enthalpy and which the least negative? P, S, Cl, F. Explain your answer.

Which of the following pairs of elements would have a more negative electron gain enthalpy?

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

Assertion (A): The value of electron gain enthalpy decrease while moving left to right in a period. Reason (R): The electron gain enthalpy is the energy which released hence it represented with negative sign.