Bromine has two naturally occurring isotopes. Bromine-81 has a mass of 80.916 amu and an abundance of 49.31%. Bromine-79 has a mass of 78.920. What is the abundance of Bromine-79

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.

the answer is 303.15 or 303