Use the trends in ionization energy and electron affinity to explain why sodium bromide has the formula NaBr and not Na2Br or NaBr2. Which one of the following is the correct statement?
a) All metals form 1+ ions and sodium is a metal.
b) Sodium only has one electron, so it has only one to lose.
c) Sodium has only one valence electron which can be lost relatively easily; removing a second electron would be more difficult because it would have to be a core electron.
