Citric acid is an organic compound with the chemical formula HOC (CO 2 H) (CH 2 CO 2 H) 2. Answer (1 of 6): As written, the question has no simple answer, because while all acids necessarily ionise to an extent (forming hydrated protons in aqueous solution), many are complex organic molecules which are covalently bonded. Zinc and Cadmium (group 2B) form [+2] cations like the group 1B alkaline earth metals. 6. To correctly specify how many oxygen atoms are in the ion, prefixes and suffixes are again used. [CDATA[*/{"annotations":null,"assetRoot":null,"branding":null,"clientUrl":"https://cdn.hypothes.is/hypothesis/1.38.0/build/boot.js","oauthEnabled":null,"onLayoutChange":null,"openLoginForm":null,"openSidebar":null,"query":null,"services":null,"showHighlights":"always","sidebarAppUrl":"https://hypothes.is/app.html","subFrameIdentifier":"042088413939617153","pluginClasses":{}}/*]]>*/, /**/, /**/, /*