Identify the ion ratios needed to form neutral compounds from the ions below. The metal ion (cation) is listed first, and the nonmetal ion (anion) is listed second. Make sure to give each ratio in its most simplified form. Na+:Br– = 1 : ⇒ 1 Al3+:Cl– = 1 : ⇒ 3 Mg2+:O2– = 1 : ⇒ 1 Al3+:O2– = 2 : ⇒ 3