Here's why:
* Elements are the simplest pure substances made up of only one type of atom.
* Molecules are formed when two or more atoms bond together.
Calcium exists in its elemental form as individual calcium atoms. It's a metal, and in its natural state, it forms a metallic bond with other calcium atoms to form a solid structure.
To illustrate the difference:
* Calcium (Ca): A single atom of calcium.
* Calcium chloride (CaCl2): A molecule formed by one calcium atom and two chlorine atoms bonded together.
Let me know if you have any other questions!
