Elements of groups IA and IIA form many compounds with elements of the third long period passing back from bismuth to platinum; fewer compounds are formed with elements of the second and earlier periods. The incidence of such compounds has been analysed graphically such that the valencies on the components may be inferred. The compounds exhibit low valency on the second/third long period component, and normal valency on the A-element. The compounds are covalent in character, and are formed across the ionic divide consistent with Fajans’ rule.
MST/464
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