Can an ion be a type of molecule?

Question

can an ion be a type of molecule or only an atom?

Answer 1

All that's required is the ability to gain or lose one or more electrons, so yes, radicals like OH, CO3, etc are ions also.

Answer 2

Yes, an ion could be a molecule. Two examples are the ammonium ion (NH4+) or hydronium ion (H3O+) or acetate ion (CH3COO-). There are many.

Answer 3

Of course.  Most ions are molecules - with an electrical charge on them.

-John