Question

Which of the following is an example of an ion?
Ar
Na+
F+
CI-

Answer 1

Answer:

Na+ is cation while F- and Cl- are anion

I think you mistyped Fe+ as F+ if it is so than it is a cation.

So all except Argon are ions which is a stable atom.

Answer 2

Explanation:

Na+ and Cl- are ions.

Ions are formed when valence electrons are donated or gained by atoms.

here, F+ is fluorine which can't be a cation because it gains electrons.

Argon is a noble gas and doesn't form ions.