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A soft, ductile, and silvery-white metal that tarnishes when exposed to air. It is the second element in the lanthanide series, and while it often shows the oxidation state of +3 characteristic of the series, it also has a stable +4 state that does not oxidize water. Cerium dioxide is employed in the optics industry for the fine polishing of glass.

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A soft, ductile, and silvery-white metal that tarnishes when exposed to air. It is the second element in the lanthanide series, and while it often shows the oxidation state of +3 characteristic of the series, it also has a stable +4 state that does not oxidize water. Cerium dioxide is employed in the optics industry for the fine polishing of glass.

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Cerium(III) is more stable

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Cerium is soft

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Cerium hasn't odor.

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Cerium was not known by alchemists.

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