What is the chemical symbol for Helium?
This chemical element is even lighter than air! A liter of air weighs about 1.2 grams while a liter of the noble gas weighs only 0.18 grams! Amazing!
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This chemical element is even lighter than air! A liter of air weighs about 1.2 grams while a liter of the noble gas weighs only 0.18 grams! Amazing!