Ultimately, polyatomic ions generally variety which happen to be covalently bonded atoms where the total number of protons will not be equal to the whole number of electrons. KCN is used like a photographic fixer from the wet plate collodion procedure.The KCN dissolves silver where it hasn't been made insoluble https://kylerhifxp.elbloglibre.com/30317387/potassium-cyanide-vs-hydrogen-cyanide-things-to-know-before-you-buy