Chemistry

Which of these is an element?

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What alkali metal is highly radioactive and decays into either astatine, radium, or radon?
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Which of these is a chemical form of communication?
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What mineral has the chemical formula PbS?
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What are the two alkalines to be found in the kitchen?
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What is the boiling point of water on the Celsius scale?
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What is the main active chemical in marijuana?
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What is the smallest part of matter called?
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Which of the following elements has the heaviest atomic weight?
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