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in the beginning there were only 8 now there are more than 120 - what are they?
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Champagne, I thought Oxygen was discovered by Priestley. Scheele just arranged the known elements into their periods, according to what he thought were their numbers of electrons. He got a few wrong, if my memory serves me well, but he predicted quite a lot of other elements that had not yet been discovered, by looking at the gaps, and he also predicted what their properties would be. Clever chap.