How much does all the planets weigh together?

 Planets / Mass

5.972 x 10^24 kg = Earth

Explanation:  https://spaceplace.nasa.gov/planets-weight/

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.