Chemistry

What alkali metal is highly radioactive and decays into either astatine, radium, or radon?

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What halogen element exists as a liquid at room temperature?
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What symbol appears on the periodic table for Sulfur which has the atomic number 16?
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What is known as the energy required to start a chemical reaction?
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What happens to water when it gets close to freezing?
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What is table salt's chemical name?
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What is the half-life of Rubidium-Strontium 87?
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What alkali metal is used in batteries and certain medicines?
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