Chemistry

Which of these is an element?

More Questions from Chemistry
What is a mixture of gases that can be stored and transported like natural gas?
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While acids dissolve most metals, what special mixture of acids is used to dissolve gold?
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Which reagent is not commonly used to hydrate oplephins?
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Scotch tape and plastic wrap are made from what?
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Which suicidal 19th century chemist has the single line etched on his tombstone "S=k log W"?
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What is the chemical symbol for gold?
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What is added to salt to prevent thyroid disease?
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Which atomic particle is outside the nucleus?
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