In CaBr, ionic bond is present. When one of the atom loses electrons and gets positive charges and other atom gains electrons and become negative. As a result of positive and nagative charges , a ionic bond formed.
As in this case, Ca loses electrons and become positive ion while on the other hand bromide gets the electrons and become negative ion.
<em>Note:</em>
Electropositive atoms always loose electrons Like Ca while electronegative atoms always gain elelctrons like Br.
I think the correct answer from the choices listed above is the third option. <span>Calcium and bromine have formed a bond. Leading up to this, calcium gave up electrons. It was a positive ion. Giving up electrons would make an atom more positive. Hope this answers the question. Have a nice day.</span>