Abathroom scale is most likely measuring in milligrams into grams grams or kilograms

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.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.