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Metallic cerium is prepared by reduction techniques, such as by reducing cerous fluoride with calcium, or by electrolysis of molten cerous chloride or other cerous halides.

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Argon is a colourless and odourless gas present to a very small extent in the atmosphere.

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Mercury was known to ancient Chinese and Hindus before 2000 BC and was found in tubes in Egyptian tombs dated from 1500 BC It was used to forma amalgams of other metals around 500 BC.

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deficient animals require 50% more food to gain the same weight of an animal supplied with adequate amounts of zinc

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rancium occurs as a result of α disintegration of actinium.f

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Dysprosium has a metallic, bright silver lustre. It is relatively stable in air at room temperature, but dissolves readily, with the evolution of hydrogen, in mineral acids

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Francium occurs as a result of α disintegration of actinium.

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chlorine is a greenish yellow gas which combines directly with nearly all elements.

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The metal is characterised by a spectrum containing two bright lines in the blue (accounting for its name). It is silvery gold, soft, and ductile.

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Cobalt is a brittle, hard, silver-grey transition metal with magnetic properties similar to those of iron (ferromagnetic).

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

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Metallic antimony is an extremely brittle metal of a flaky, crystalline texture

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

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Actinium is dangerously radioactive.

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Elemental arsenic occurs in two solid modifications: yellow, and grey or metallic, with specific gravities of 1.97, and 5.73, respectively. T

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Elemental arsenic occurs in two solid modifications: yellow, and grey or metallic, with specific gravities of 1.97, and 5.73, respectively. T

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arsenic-

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Calcium as the element is a grey silvery metal.