The lewis structure for ethylene, c2h4, is shown. how many valence electrons do the two carbon atoms in the molecule share with each other in the double bond?

the correct answer is 2

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.