331 results about "Divalent" patented technology

In chemistry, a divalent element, ion, functional group or molecule has a valence of two. Valency is the number of chemical bonds formed, which may be covalent, polar covalent or ionic. Examples: Divalent elements include calcium and sulfur. While the bonds formed by calcium are ionic; sulfur can form covalent bonds as in H₂S or ionic bonds as in Na₂S. Divalent anions have a charge of -2, for example S2– and SO₄2–. Divalent cations have a charge of +2, for example Fe²⁺, Ca²⁺ and Hg₂²⁺. Divalent functional groups include the imino, =NH, and carbonyl, =O.