what is the chemical formula of a compound that is composed of the ions ca²⁺ and br⁻?\ncabr\ncabr2\nca3br\nca…

Explanation:

Step1: Balance the charges

The calcium ion ($Ca^{2 +}$) has a charge of +2 and the bromide ion ($Br^{-}$) has a charge of -1. To balance the charges, we need 2 bromide ions for every 1 calcium ion.

Step2: Write the chemical formula

We write the symbol of the cation (calcium, $Ca$) first and then the symbol of the anion (bromine, $Br$) with a sub - script indicating the number of ions. So the formula is $CaBr_{2}$.

Answer:

B. $CaBr_{2}$