Use the following periodic table to you. calcium and bromine have formed a bond. leading up to this, calcium gave up electrons. it was a(n) negative ion shared ion positive ion neutral atom

In order to form ionic bonds (bonds of metals and non metals together), the metal atom must give up electrons to the non-metal and turns into a ion (cation specifically).

Since calcium is a metal, when it forms ionic bond with bromine, a non-metal, calcium atoms must give up electrons. As you may know, each electron carries a negative charge. Therefore, when a atom loses negative charged electrons, they become positive, due to the remaining protons are more than electrons (protons carry positive charge).

Therefore, the answer is a positive ion.