What is the difference between methane and hydrogen

Methane is a compound containing two elements, carbon and hydrogen. It exists naturally as a molecule. Each methane molecule has a central carbon atom joined to and surrounded by four hydrogen atoms. The chemical formula of methane is CH₄. By molecular weight, methane is 16.04/2.016 = 7.956 times as heavy and therefore as dense as hydrogen (at the same temperature and pressure). That is, hydrogen takes up about eight times as much volume as methane for the same amount of mass.

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the answer is d.) potassium