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Copper appears in the periodic table at the top of Group 11 above silver and gold.

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Iron meteorites, or siderites, may contain iron alloyed with from 5 to nearly 20% nickel.

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Iron is a relatively abundant element in the universe.

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Its compounds are toxic.

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Calcium is an essential constituent of leaves, bones, teeth, and shells

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Potassium is an essential constituent for plant growth and it is found in most soils.

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The gas irritates the mucous membranes and the liquid burns the skin.

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Sulphur is essential to life.

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It is an essential component of living systems and is found in nervous tissue, bones and cell protoplasm.

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Silicon is present in the sun and stars and is a principal component of a class of meteorites known as aerolites.

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Pure aluminium is a silvery-white metal with many desirable characteristics.

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Magnesium metal burns with a very bright light.

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Group 1 elements are often referred to as the "alkali metals".

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Neon forms an unstable hydrate.

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Fluorine is the most electronegative and reactive of all elements.

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About one fifth of the atmosphere is oxygen gas, the atmosphere of Mars contains only about 0.15% oxygen.

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Nitrogen makes up about 78% of the atmosphere by volume but the atmosphere of Mars contains less than 3% nitrogen.

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Carbon is a Group 14 element and is distributed very widely in nature.

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Lithium seems to have no biological role, but does have an effect on the body if swallowed.

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Helium is the second most abundant element in the universe after hydrogen. α-particles are doubly ionised helium atoms

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Hydrogen is present in all organic compounds.