Elements and compounds
is made up of atoms only, so it is an element.
An element is a substance that is made up of one kind of atom only.
Every element has a name and a symbol and is displayed on the Periodic Table.
| Element | Symbol: |
| Carbon | C |
| Hydrogen | H |
| Aluminium | Al |
| Sodium | Na |
| Potassium | K |
| Lithium | Li |
| Silver | Ag |
| Mercury | Hg |
| Lead | Pb |
Elements can combine with each other to form compounds.
A compound contains two or more kinds of atoms joined together.
The symbol for a compound is called its formula. It is made up from the symbols of the elements it contains and also tells us about the % composition of each element within the compound.
Example: H2O - A molecule of water contains 2 hydrogen atom for every oxygen atom.
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