Chemistry

What radioactive metallic element, found in all uranium ores, has an atomic number of 89?

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What makes matter expand when it's heated and contract when it's cooled?
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What element gives the diamond its blue color?
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What alkali metal is used in batteries and certain medicines?
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Which of these molecules are not planar?
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What alkali metal is highly radioactive and decays into either astatine, radium, or radon?
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What was the fifth unearthly element from the days of Aristotle?
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