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Argon is a colourless and odourless gas present to a very small extent in the atmosphere. Argon is very inert (indeed it is referred to as one of the noble gases) and is not known to form true chemical compounds.

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Pure aluminium is a silvery-white metal with many desirable characteristics. It is light, nontoxic (as the metal), nonmagnetic and nonsparking.

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Copper is one of the most important metals. Copper is reddish with a bright metallic lustre.

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Boron is a Group 13 element that has properties which are borderline between metals and non-metals (semimetallic)

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Hydrogen is the lightest element. It is by far the most abundant element in the universe and makes up about about 90% of the universe by weight. It is also the most abundant element in the earth's sun.

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