Critique your friend's argument that there is no need for scientific names for organisms
and that existence of both scientific and
common names for organisms will only
onfuse people.

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.

let that person have a turn to speak : )