Question

Why the oxides and sulphides formed by negative electron affinity are stable

Answer 1

Explanation:

Electron affinity is the affinity of an element to an electron. As more than one electron can be introduced in an atom, it is called second electron affinity for the addition of two electrons and so on. The first Electron Affinities of active non-metals is positive (exothermic) while the second E. A. even for the formation of oxide or sulphide ion is negative (endothermic). For example, the overall E.A. for the formation of oxide or sulphide ions has been found to be endothermic to the extent of 640 and 390 kJ mol-1 respectively. This is measured by the energy released when an element in its gaseous state accepts an electron to form an anion.

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