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Atomic Number: 82 Pb
Elemental lead is found in nature sparingly. Lead is present in ores such as galena (lead sulphide, PbS),

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Atomic Number: 53 I
In nature, iodine exists as iodide ions, I⁻, and it is as iodide that it is taken into our bodies. Iodine is an essential component of the human diet and in fact appears to be the heaviest required element in the diet. Iodine compounds are useful in medicine.

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Atomic Number: 26 Fe
Iron compounds are essential to all life. For example, it is an iron atom in haemoglobin that is responsible for carrying oxygen around the blood stream.

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Atomic Number: 1 H
Hydrogen makes up two of the three atoms in water and water is absolutely essential to life. Hydrogen is present in all organic compounds.

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Atomic Number: 2 He
Helium is present in the atmosphere at about 0.0005% (1 part in 200000) by volume and is an important component within hydrocarbon gases in the USA.

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Atomic Number: 79 Au
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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Atomic Number:  105 Db
Dubnium has no biological role.

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Atomic Number: 29 Cu
Copper is essential for all life, but only in small quantities. It is the key component of redox enzymes and of haemocyanin.

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Atomic Number :  20 Ca
Calcium is essential for all life. It forms part of cell walls and bones. It is important for blood clotting.

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Atomic Number: 6 C
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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Atomic Number: 13 AI

Aluminium may be involved in the action of enzymes such a succinic dehydrogenase and δ-aminolevulinate dehydrase.

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Atomic Number: 63 Eu
Europium has no biological role.