Which of the following sets of elements would be good conductors of both heat & electricity
CI, Br, I
At, P, Se
Fe, Cu, C
Au, Ag, W

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.