Sodium ions are used by your body every time you move a muscle. the difference between the na+ ions and atomic na is that a) ionic sodium has one more electron. b) atomic sodium has one more electron. c) atomic sodium has one fewer electron. d) ionic sodium is only found in the body.

B) atomic sodium has one more electron.

This can be easily seen if you compare the charges - ionic sodium carries one more positive charge than atomic sodium, so ionic sodium must have one fewer electron.

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.