Chemistry C1 Notes

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C1.1.1 Atoms 

A substance that is made from only one sort of atom is called an Element. There are about 100 different naturally occuring elements. Elements are shown in the form of the periodic table. The groups in the periodic table contain elements with similar properties. The numbers above the colomns show the group number. Li, Na, K, Rb, Cs, Fr are all in group 1 and have similar chemical properties. 

Atoms of each element are represented by a chemical symbol, for example, O represents an atom of oxygen, and Na represents an atom of sodium. The periodic table shows the


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