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from the Greek word "Magnesia", a district of Thessaly

In 1618 a farmer at Epsom in England attempted to give his cows water from a well. This they refused to drink because of the water's bitter taste.

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R. Kohlrabies, P. Donner, and N. Schmidt-Prang he, Z. Angel. Phys.,

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You may view the structure of hydrogen:

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Helium has no biological role.

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Gold is not a necessary trace element for living things and neither are any of the other third row d-block elements.

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Fluorine as fluoride (F⁻) is probably an essential element for humans and certainly is for some molluscan.

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Chlorine as chloride (Cl⁻) is essential for mammals and plants. Digestive juices in the stomach contain hydrochloric acid.

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Cerium has no biological role but is said to stimulate the metabolism.

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Carbon is key to life and by definition is present in all organic compounds. The study of life is known as biological chemistry or biochemistry. Ethene gas (C₂H₄) helps to ripen tomatoes.

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Calcium Symbol: CaAtomic number: 20     

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Calcium Symbol: CaAtomic number: 20     

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Calcium is essential for all life. It forms part of cell walls and bones. It is important for blood clotting.

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Argon has no biological role.

Argon is present in the atmosphere which contains nearly 1% argon gas.

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Aluminium may be involved in the action of enzymes such a succinct dehydrogenase and δ-nondenominational dehydrate (involved in porphyritic synthesis.