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compare the properties of hydrogen and helium
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hydrogen and helium are both noble gases, meaning they do not react with other substances. however, hydrogen is lighter and more reactive than helium, with a boiling and melting point of -253.15 °c and 14.01 k respectively. helium is the most abundant element in the universe and has a much higher boiling and melting point of -268.930 °c and 4.15 k respectively.
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