Many of these are oxyanions with oxygen being bonded to a nonmetal and others are carboxylate ions. Electronegativity definition. Using the Principle of Charge Neutrality (section 2.6.6) and knowing the charge of the ions allows you to determine the formula. Polyatomic ions are covalent units (molecules) where the total number of protons \(\neq\) to the total number of electrons and they were introduced in section 2.6.4.2. Electronegativity refers to the ability of an atom to attract electrons to form a chemical bond. Calcium carbonate (CaCO3) has ionic bonding between calcium ion \(\ce{Ca^{2+}}\) and a polyatomic ion, \(\ce{CO_3^{2-}}\), but within the carbonate ion (CO32-), the carbon and oxygen atoms are connected by covalent bonds (shown above). Nitrogen trioxide. 100% (1 rating) Answer: . 3. [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":"06664047888189506","pluginClasses":{}}/*]]>*/, /**/, /*