Description

150 years of the periodic table's development are described through discovery of four chosen elements over this time period, by chemists from different countries, even of different chemistry periods – truly periodic!

Periodic table

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Iodine in thyroid function and how simple organification of an amino acid produces these essential hormones.

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The importance of molecular oxygen, atomic oxygen, ozone and the hydroxyl radical in the Earth's atmosphere.

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There is no suitable substitute for molecular nitrogen in the atmosphere, which emphasises its necessity for life.

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