What is the formula of the compound formed by Ba and F?
The formula unit is
Since this is an ionic compound, its chemical formula is called a formula unit because there are no discrete molecules. A formula unit represents the lowest whole number ratio of elements in the compound.
Barium is a group 2 element. Group 2 elements form cations with a
Ionic compounds are neutral, so the charges of the positive and negative ions must equal zero when added. So for every
You can also use the "crisscross method" to determine the formula for an ionic compound as shown below.