Answer:
[tex]Mn(CH_{3} CO_{2} )_{2}[/tex] is the first one
[tex]Au_{2} O[/tex] is the second one
Explanation:
The roman numeral indicates the charge on the cation (the positively charged ion in the ionic compound, almost always a metal). So manganese (II) acetate tells us there will be a charge of 2+ on the Mg. Gold (I) oxide has a charge of 1+ on the Au.
When a ionic compound is formed, the total charge of the compound (the sum of the postive and negative charges) must equal zero.
Acetate is a polyatomic ion with a charge of 1-. This means there will need to be two of them to balance out the charge on the manganese.
Oxygen, when ionized, has a charge of 2-. This means there will need to be two gold atoms to balance out the negative charges.
