How many types of elements
Nonmetals: The term "nonmetals" is used to classify hydrogen (H), carbon (C), nitrogen (N), phosphorus (P), oxygen (O), sulfur (S) and selenium (Se). Halogens: The halogenelementsare a subset of the nonmetals. They comprise Group 17 of the periodic table, from fluorine (F) through astatine (At).

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