व्हाट इज हिलियम एंड हाइड्रोजन गैस
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Answer:dont know hindi sorkrfd
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Helium and hydrogen are chemical elements that are mostly found in the atmosphere as gaseous substances due to their very low melting and boiling temperatures. The main difference between Helium and hydrogen is that helium atom exists as a monoatomic gas in the atmosphere whereas hydrogen exists as a diatomic gas in the atmosphere.
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