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Gases facts

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Chemistry quiz
What is the chemical symbol of helium?
He. H is the chemical symbol of hydrogen. Hg is the chemical symbol of Mercury.
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chemical elements facts
Which of the following is not a chemical element?
Methane. Neon, chlorine and nitrogen are chemical elements. Methane is a chemical compound, the simplest alkane and the main component of natural gas.
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chemical elements facts
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