Question

what is the chemical formula of a compound that is composed of the ions ca²⁺ and br⁻?
cabr
cabr2
ca3br
ca3br2

Explanation:

Step1: Determine ion charges

Calcium ion $Ca^{2 + }$ has a charge of + 2, bromide ion $Br^{-}$ has a charge of - 1.

Step2: Balance charges

To make the compound electrically - neutral, we need 2 bromide ions for every calcium ion.

Answer:

B. CaBr2