Eventually, polyatomic ions often variety which might be covalently bonded atoms where the overall number of protons isn't equivalent to the whole number of electrons. KCN is used being a photographic fixer within the soaked plate collodion approach.The KCN dissolves silver where it hasn't been made insoluble with the developer. https://fernandohfczv.blogspothub.com/29792611/potassium-cyanide-vs-hydrogen-cyanide-things-to-know-before-you-buy