Which of the following is NOT a part of a circuit? source pathway current load

Pathway

Explanation:

Pathways and Circuits are different things, so it can't be part of it.

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.