Question

decresing order of electron affinity of various chalcogens is ____​

Answer 1

Question:  decresing order of electron affinity of various chalcogens is ___________

Answer: ​Electron affinity increases from the first element to the second element in a group. It is applicable to all p-block element groups. Hence, oxygen has lesser electron affinity than that of sulphur and however in a group, it decreases from top to bottom as size increases.

                           

    Electron affinity of S is more than oxygen due to small size of oxygen. The addition of extra electron to oxygen causes more inter-electronic repulsion which decreases the electron affinity.

Hence, correct order is S > Se > O.

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