Chemistry

What halogen is extremely rare and is considered one of the rarest naturally occurring elements on Earth?

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What is the most abundant element in the known universe?
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What alkaline earth metal is formed from the decay of uranium?
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In RNA thymine from DNA is replaced by what?
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What state of matter takes a shape of its own?
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In a triple bond, how many each pi and sigma bonds are there?
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Which element was the first ever artificially created?
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Which of these chemicals is often used to reduce phosphates in water?
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What is another name for salt?
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