The sulphides of zinc, cadmium, and mercury form part of the following series of diatomic compounds:- ZnO CdO HgO ZnS CdS HgS ZnSe CdSe HgSe ZnTe CdTe HgTe which are all chemically similar. One of the constituents of these substances has a positive and the other a negative electrovalency of two:- positive electrovalency of two- Zn, Cd, Hg. negative electrovalency of two-O, S, Se, Te.
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Piyali Sengupta (1934) studied this question.