Question

Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O, S, F and Cl ?
(a) Cl < F < O < S
(b) O < S < F < Cl
(c) F < S < O < Cl
(d) S < O < CI < F

Answer 1

(b) will be the answer

electron electron gain enthalpy or electron affinity generally becomes more (-)ve on moving from left to right along a period this is because on moving across a period the atomic size decreases.

so the coulombic attraction or attractive interaction of nucleus on the outer shell electron increases. Consequently atom has a greater tendency to gain an

electron. Hence electron gain enthalpy become more negative.

chlorine has more negative electron gain enthalpy or electron affinity than fluorine because in F the upcoming electron goes to smaller 2p orbital and suffers significant electrostatic repulsion from the electrons already present in that orbital and fluorine also possesses high charge density. ( Same reason for O< S)

Answer 2

Explanation:

hope u understand

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