For instance, what happens to the electronegativity of an atom as we move down the group or across the period? Aluminum oxide. 100% (1 rating) Answer: . Our electronegativity calculator is here to help you with your chemistry questions related to bonds between atoms. Its atomic number is 55 u. The second element, chlorine, becomes chloride, and we attach the correct numerical prefix (tetra-) to indicate that the molecule contains four chlorine atoms. [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":{}}/*]]>*/, /**/, /**/, /**/. One carbonate ion at a charge as a group ( poly = many ) molecular of... ] cation and a non-metal ) atom as we move down the 1B. 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