Question

How is an ion different from an atom? How is cation different from anion?

Answer 1

Difference between ion and atom:

Atom	Ion
The building blocks of all matter are atoms.	Compound composed of metals and non-metals have charged species. The Charge species known as ions.

Difference between cation and anion:

Cation	Anion
A positively charged ion is called a cation.	A negatively charged ion is called an anion.
For example : Na+, Ca2+, Mg2+	For example: Cl-, SO42-, CO32-