Question #79da4

1 Answer
Apr 23, 2017

Answer:

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.