When the half-reactions br2 +2e- ? 2br- and na ? na+ +e- are combined, the balanced redox equation is a. na + br2 +e- ? na+ + 2br- b. 2na + br2 ? 2na+ + 2br- c. na + br2 ? na+ + 2br- d. 2na + br2 + 2e- ? 2na+ + 2br- + e-

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.