WORTH 35 POINTS! MY LIFE DEPENDS ON IT HELP! When naming ionic compounds, always
1. use prefixes
2. write the metal first
3. write the nonmetal first
4. capitalize the metal and nonmetal

Answer

2.Write the metal first ( if I am right) as it is ionised

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.