• Latin name:
  Helium
• English name:
  Helium
• Year discovered:
  1868
• Discovered by:
  Pierre Jules César Janssen, Joseph Norman Lockyer
• Country of Discovery:
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• Cost per 100 grams:
  2.5 USD
• CAS Number:
  CAS7440-59-7
• Electron shell:
  K2-L0-M0-N0-O0-P0-Q0-R0

Helium is a chemical element with symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas that heads the noble gas group in the periodic table. Its boiling and melting points are the lowest among all the elements.

• Atomic number:
  2
• Atomic weight (Relative atomic mass):
  4.00260128098301 (g/mol)
• Density:
  0.0001785 (g/cm³)
• Melting point:
  -273.15°C = -459.67°F = 0.00K
• Boiling point:
  -268.928°C = -452.07°F = 4.22K
• Valence electrons:
  0
• Period:
  1
• Group:
  VIIIA
• Block:
  s - block
• Emission spectrum:
  

• Phase:
  Gas

  
• Fusion heat:
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• Specific heat:
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• Thermal expansion:
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• Vaporization heat:
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• Electron configuration:
  1s2
Oxidation states:

• 0
• -
• -
• -
• -
• -
• -
• -
• -
• -
• -
• -
• -
• -
• -
• Ion charge:
  ----
• The ionization potential of an atom:
  24.547 (eV)
• Atomic radius:
  31 (pm)
• Covalent radius:
  37 (pm)
• Van der Waals radius:
  140 (pm)

• Electrical conductivity:
  ----
• Electrical type:
  ----
• Magnetic type:
  Diamagnetism
• Volume magnetic susceptibility:
  -1.05 ⋅ 10^-9
• Mass magnetic susceptibility:
  -5.9 ⋅ 10^-9
• Molar magnetic susceptibility:
  -2.36 ⋅ 10^-11 (m³/mol)
• Resistivity:
  ----
• Superconducting point:
  ----

• Debye temperature:
  ----

• Colour:
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• CAS Number:
  CAS7440-59-7
• CID Number:
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• RTEC Number:
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• Brinell hardness:
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• Mohs hardness:
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• Vickers hardness:
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• Bulk modulus:
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• Young's modulus:
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• Liquid density:
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• Molar volume:
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• Poisson's ratio:
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• Shear modulus:
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• Speed of sound transmission:
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• Refractive index:
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• Thermal conductivity:
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• Electronegativity:
  ----
• Valence electrons:
  0
• Electron affinity:
  -48.0 kJ/mole

• Radioactive:
  No
• Half life:
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• Lifetime:
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• Neutron cross section, barn:
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• Universe contains "Helium" at the rate of
  23.0%
• Sun contains "Helium" at the rate of
  27.1%
• Oceans contain "Helium" at the rate of
  7.2 ⋅ 10^-8%
• Human body contains "Helium" at the rate of
  ----
• The Earth's crust consists of "Helium" at the rate of
  8.0 ⋅ 10^-7%
• Meteorites consist of "Helium" at the rate of
  ----