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The Language of Chemistry

Making Compounds

Now we can have some fun making compounds. The table below gives you a few examples:

Remember the Rule : All of the bonding arms must be used!

Name of compound

Atoms required

Molecule

Notes

sodium chloride

Sodium

Chlorine

Sodium Chloride

Both sodium and chlorine have one bonding arm. One chlorine atom is needed to bond with one sodium atom.

calcium oxide

Calcium

Oxygen

Calcium oxide

Both calcium and oxygen have two bonding arms. One calcium atom is needed to bond with one oxygen atom.

hydrogen sulphide

Hydrogen

Sulphur

Hydrogen sulphide

The hydrogen atom has one bonding arm. A sulphur atom has two. Two atoms of hydrogen are needed to join with the sulphur atom.

iron II chloride

Iron

Chloride

Iron II chloride

The name tells us that iron has two bonding arms in this compound. Chlorine has one. Two chlorine atoms are needed to bond with one iron atom.

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You may have noticed that metals never make chemical bonds with other metals. Non-metals, however, can make chemical bonds with either metals or other non-metals.

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