. Which one of the following arrangements represents the correct order

of least negative to most negative electron gain enthalpy for C,Ca,Al,F and O?

(a) Al < Ca < O < C < F

(b) Al < O < C < Ca < F

(c) C < F < O < Al < Ca

(d) Ca < Al < C < O < F

Best Answer

 Correct Option is: B

The amount of energy released when an electron is added to an isolated gaseous atom is known as electron gain enthalpy. Energy can be released or absorbed with the addition of an electron. Within a period, the electron gain enthalpy becomes less negative towards the bottom of a group and more negative towards the right.

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