Importance of electron affinity : Certain properties of the elements are predicted on the basis of values of electron affinity.
(i) The elements having high value high values of electron affinity are capable of accepting electron easily. They form the anion and electrovalent compounds. This type of elements is electronegative in nature.
(ii) The elements having high values of electron affinity act as strong oxidising agents, for example, F, CL, Br, O, S etc.
On the basis of the general trend of ionisation potential and electron affinity, the below stated properties can be predicted,
(a) Metallic nature decreases in a period while nonmetallic nature increases. The metallic nature increases in the group while non-metallic nature decreases in the group. The arrow represents a group and represents a period.
(b) Reducing nature decreases in a period while oxidising nature increases. Reducing nature increases in the group while oxidising nature decreases in the group.
(c) The stability of metal increases while activity of metal decreases in the period and in a group stability decreases while activity increases.
This trend is observed particularly in IA, IIA and IIIA elements.
(d) The basic nature of the oxides decreases in a period while acidic nature increases. In the group, basic nature increases while the acidic nature decrases.
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