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Titanium has no biological role. The metal is regarded as hypoallergenic.

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Silver has no biological role.Silver is found sometimes as the free metal as well as in ores such as argentite (silver sulphide, Ag₂S). There are deposits in Australia, Canada, Chile, Germany, Mexico, Norway, Sardinia, and the USA.

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Fluorine as fluoride (F⁻) is probably an essential element for humans and certainly is for some molluscs. In some areas, fluoride ion is added to drinking water (in very low concentrations) since it renders tooth enamel relatively immune to bacteriological attack.

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Nickel is an essential trace element for many species. Chicks and rats raised on nickel-deficient diets have liver problems. Enzymes known as hydrogenases in bacteria contain nickel. Nickel is also important in plant ureases.

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Mercury has no biological role but is widespread in the biosphere and in food chains, including ours.

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Cobalt salts in small amounts are essential to many life forms, including humans. It is at the core of a vitamin called vitamin-B₁₂. Grazing animals do not to do well in areas where there is little cobalt in the soil.

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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 compounds are toxic to most plants and somewhat toxic to mammals.

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Boron is probably not required in the diet of humans but it might be a necessary "ultratrace" element. Boron is required by green algae and higher plants.

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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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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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Sodium is a vital element. The human diet must contain a sensible amount of sodium. The sodium cation is the main extracellular (outside cells) cation in animals and is important for nerve function in animals.

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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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Lead has no biological role. Lead affects the gut, central nervous system and causes anaemia.

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H₂ gas is present in the earth's atmosphere in very small quantities, but is present to a far greater extent chemically bound as water (H₂O) Water is a constituent of many minerals.

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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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Lithium seems to have no biological role, but does have an effect on the body if swallowed. Sometimes, lithium-based compounds such as lithium carbonate (Li₂CO₃) are used as drugs to treat manic-depressive disorders.

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oxygen is all around as we used it to breathe