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Helium 

  • Discovered in 1895 by Sir William Ramsay in London, and independently by Per Teodor Cleve and Nils Abraham Langlet in Uppsala, Sweden

  • Atomic Radii:  31 pm 

  • Melting Point: Unknown 

  • Boiling Point: âˆ’268.928°C

 

Applications:

-often used to fill decorative balloons, weather balloons and airships

-a mixture of 80% helium and 20% oxygen is used as an artificial atmosphere for deep-sea divers and others working under pressurised conditions

-used as a cooling medium for the Large Hadron Collider (LHC) and MRI scanners 

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