* Carbon (C): A non-metal element

* Oxygen (O): A non-metal element

Important Note: CO3 is not a complete molecule. It is an ion with a -2 charge. It needs to combine with other ions to form a neutral compound, such as:

* Calcium Carbonate (CaCO3), found in chalk, limestone, and seashells.

* Sodium Carbonate (Na2CO3), commonly known as washing soda.

Let me know if you have any other questions!