TOPIC 3. IONIC COMPOUNDS: formation, formulas and naming ...

III - 3 Likewise, the ionic compound aluminium oxide containing Al3+ ions and O2– ions has the 2–formula Al3+ 2 O 3 so that the total positive charge (6 +) exactly equals the total negative charge (6 !). In this section, the formulas of all ionic compounds shown have included the charge on the cation and anion as superscripts, e.g. Na+Cl– ................
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