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- History of the periodic table (7005 bytes)
4: ...]], a philosopher, theorised that everything is made up of a mixture of one or more of four [[element]...
5: ...|thumb|150px|left|Chemistry Clipart .Clipart provided by
10: ...atterns in the way chemicals reacted and began to devise ways to classify the elements.
15: ...mpiling these, D?einer proposed that nature was made of triads of elements. He inferred that in a tria...
18: ...yond triads. During this time, [[fluorine]] was added to the halogen group and [[oxygen]], [[sulfur]],...
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