Question

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

Explanation:

An ion is formed when an atom loses or gains electrons. Sodium ion ($Na^+$) is formed when a sodium atom loses one electron. So, a sodium ion has one fewer electron than a sodium atom.

Answer:

C. a sodium atom has one fewer electron.