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In page Lutetium:

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Lutetium metal is slightly unstable in air at standard conditions, but it burns readily at 150 °C to form lutetium oxide. The resulting compound is known to absorb water and carbon dioxide, and it may be used to remove vapors of these compounds from closed atmospheres.[3] Similar observations are made during reaction between lutetium and water (slow when cold and fast when hot); lutetium hydroxide is formed in the reaction.[4] Lutetium metal is known to react with the four lightest halogens to form trihalides; except the fluoride they are soluble in water.[citation needed]