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Home>Chemical Elements > List of Molecules Starting With He
  • Name:Helium
  • Symbol: He
  • Atomic Number : 2
  • Atomic Mass : 4.0026 amu
  • Melting Point : 1.15 K ? (-272.2 oC)
  • Boiling Point : 4.2 K ? (-268.9 oC)
  • Number of Protons/Electrons : 2
  • Classification: Noble Gas
  • Crystal Structure : usually hexagonal close-packed (v.high pressure needed to solidify helium)
  • Density @ 293 K: 0.1785g/cm3
  • Color:colorless