"Divalent" refers to something that has a valency or chemical combining power of two. It means that it can form two chemical bonds with other atoms or molecules. Full definition
Addition of divalent cations at low pH makes it possible to capture the uncleaved RNA in metal - bound form. (science.sciencemag.org)
Four crystal structures were determined of the catalytic domains of AC in complex with two different ATP analogs and various divalent metal ions. (science.sciencemag.org)
CNG channels are nonselective cation channels that poorly discriminate between alkali ions and even allow the passage of divalent cations. (ptglab.com)