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It is a soft, silvery-white alkali metal.
Lithium is a chemical element with the symbol Li and atomic number 3.
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It is a soft, silvery-white, highly reactive metal.
Sodium is a chemical element with the symbol Na and atomic number 11.
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Hydrogen is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass.
Hydrogen is the chemical element with the symbol H and atomic number 1.
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Potassium is a silvery-white metal that is soft enough to be cut with a knife with little force.
Potassium is a chemical element with the symbol K and atomic number 19.
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Elemental bismuth may occur naturally, although its sulfide and oxide form important commercial ores.
Bismuth is a chemical element with the symbol Bi and atomic number 83.
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Caesium has physical and chemical properties similar to those of rubidium and potassium.
Caesium is a chemical element with the symbol Cs and atomic number 55.
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It is commonly known as quicksilver and was formerly named hydrargyrum.
Mercury is a chemical element with the symbol Hg and atomic number 80.
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The bulk properties of astatine are not known with any certainty.
Astatine is a radioactive chemical element with the symbol At and atomic number 85.
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It is a gray post-transition metal that is not found free in nature.
Thallium is a chemical element with the symbol Tl and atomic number 81.
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Lead is soft and malleable, and also has a relatively low melting point.
Lead is a chemical element with the symbol Pb (from the Latin plumbum) and atomic number 82.
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Polonium was named after Marie Curie's homeland of Poland.
Polonium is a chemical element with the symbol Po and atomic number 84.