Final answer:
The charge of the ion typically formed by argon (Ar) is zero. Argon is a noble gas and does not readily gain or lose electrons to form ions.
Step-by-step explanation:
The charge of the ion typically formed by argon (Ar) is zero. Argon is a noble gas in group 18 of the periodic table, which means it has a full outer shell of electrons and is stable. Noble gases do not tend to lose or gain electrons to form ions. They exist as neutral atoms.
Unlike other elements, such as transition metals, which can form ions with variable charges, the charge of an argon ion is always zero because it does not readily gain or lose electrons.