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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...
- They will be
divided into four
groups or sections, as in the following:
Organogens—oxygen, nitrogen, hydrogen,
carbon Sulphuroids—sulfur, selenium, phosphorus...