Which equation obeys the law of conservation of mass?

passing a magnet thought the

mixture , because iron gets attracted to magnet .

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.

increased stability in the completion of fluorine's outer shell.

a corroding iron, if that's one of your choices