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At ordinary temperatures radon is a colourless gas. When cooled below the freezing point, radon exhibits a brilliant phosphorescence which becomes yellow as the temperature is lowered and orange-red at the temperature of liquid air.

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Mercury is the only common metal liquid at ordinary temperatures.

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Ordinary tin is a silvery-white metal, is malleable, somewhat ductile, and has a highly crystalline structure.

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Titanium s a lustrous, white metal when pure. Titanium minerals are quite common.

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

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Neon is a very inert element. Neon forms an unstable hydrate. In a vacuum discharge tube, neon glows reddish orange

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

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Potassium is a metal and is the seventh most abundant and makes up about 1.5 % by weight of the earth's crust

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Helium is one of the so-called noble gases. Helium gas is an unreactive, colourless, and odourless monoatomic gas

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Nickel is found as a constituent in most meteorites and often serves as one of the criteria for distinguishing a meteorite from other minerals.

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Platinum is a beautiful silvery-white metal, when pure, and is malleable and ductile.

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

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

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Most metals are metallic grey or silvery white whereas gold is characteristically a metallic yellow color, in other words gold-colored.

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Lithium is a Group 1 (IA) element containing just a single valence electron (1s²2s¹)

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Chlorine is a respiratory irritant. The gas irritates the mucous membranes and the liquid burns the skin

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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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Ruthenium, rhodium, palladium, osmium, iridium, and platinum together make up a group of elements referred to as the platinum group metals (PGM).

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Calcium as the element is a grey silvery metal. The metal is rather hard.

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Iron is a relatively abundant element in the universe. It is found in the sun and many types of stars in considerable quantity.

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Aluminium is an abundant element in the earth's crust, but it is not found free in nature.

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Carbon is present as carbon dioxide in the atmosphere and dissolved in all natural waters

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Hydrogen is present in all organic compounds