- Everything is made from atoms.
- We call the different types of atoms elements and there are about 100 different types of them.
- Two atoms can make a bigger particle called a molecule when they join together.
- Each of these different atoms have their own symbols and all of these can be found on the periodic table.
- Compounds are made when two or more of these different atoms join together.
- Elements in the periodic table are arranged in order of increasing atomic number (the number of protons).
- All of the elements in a single group have similar properties.
- The metals are shown on the left of the periodic table, and the non-metals are shown on the right.
This is a carbon atom. The number of protons in the nucleus tells you what atom you have.
- 12 ----> Mass Number ------> This is equal to the number of protons and electrons.
- 6 -----> Atomic Number ----> This is equal to the number of protons in the nucleus.
Therefore its symbol would be:
In an atom a: Proton has a charge of +1