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Boroid Organogen Sulphuroid Chloroid Noble gas B, Si H, C, N, O P, S, Se F, Cl, Br, I He, Ne, Ar, Kr, Xe, Rn...
- as in the following: Organogens—oxygen, nitrogen, hydrogen,
carbon Sulphuroids—sulfur, selenium,
phosphorus Chloroides—fluorine, chlorine, bromine,...