Question

Question #79da4

Answer 1

They all have a ratio of 1:1 for the number of positive ions to negative ions.

Explanation:

To consider the formulae of these ionic compounds, we must look at the charges on their respective ions formed.

Calcium forms a `Ca^(2+)` ion since it has two valence electrons.

Carbonate: `CO3^(2-)`
Oxide: `O^(2-)`
Sulfite, or sulfate (IV): `SO3^(2-)`
Sulfate, or sulfate (VI): `SO4^(2-)`

Since all the anions here have charges of 2-, they form ionic compounds with `Ca^(2+)` in the ratio 1:1.