5. Which is the chemical formula of calcium bromide? C Ca_(2)Br CaBr_(2) Ca_(2)Br_(2) CaBr

The chemical formula of calcium bromide is \( \mathrm{CaBr}_{2} \). This is because calcium (Ca) has a valency of +2, and bromine (Br) has a valency of -1. To balance the charges, two bromide ions are needed for each calcium ion, resulting in the formula \( \mathrm{CaBr}_{2} \).