By Jeremy Gonzalez and Clarrisa Roco
Calcium has positive two charge
Bromine has a negative seven charge
Bromine needs one extra electron and Calcium has two extra, there must be two Bromine molecules to balance out the total amount of 8 valence electrons.
Calcium gives up electrons to create a stable bond
When naming the molecule, first name the metal and then the non metal's suffix transforms to -ide