• Latin name:
  Radium
• English name:
  Radium
• Year discovered:
  1898
• Discovered by:
  Pierre Curie, Marie Skłodowska Curie
• Country of Discovery:
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• Cost per 100 grams:
  ----
• CAS Number:
  CAS7440-14-4
• Electron shell:
  K2-L8-M18-N32-O18-P8-Q2-R0

Radium is a chemical element with symbol Ra and atomic number 88. It is the sixth element in group 2 of the periodic table, also known as the alkaline earth metals. Pure radium is almost colorless, but it readily combines with nitrogen (rather than oxygen) on exposure to air, forming a black surface layer of radium nitride (Ra3N2).

• Atomic number:
  88
• Atomic weight (Relative atomic mass):
  226.032494020223 (g/mol)
• Density:
  5.50 (g/cm³)
• Melting point:
  700.0°C = 1292.00°F = 973.15K
• Boiling point:
  1737.0°C = 3158.60°F = 2010.15K
• Valence electrons:
  2
• Period:
  7
• Group:
  IIA
• Block:
  s - block
• Emission spectrum:
  

• Phase:
  Solid

  
• 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:
  [Rn] 7s2 = 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 7s2
Oxidation states:

• -
• -
• -
• -
• -
• -
• -
• +2
• -
• -
• -
• -
• -
• -
• -
• Ion charge:
  Ra²⁺
• The ionization potential of an atom:
  5.279 (eV)
• Atomic radius:
  ----
• Covalent radius:
  211 (pm)
• Van der Waals radius:
  283 (pm)

• Electrical conductivity:
  1000000.0 (S/m)
• Electrical type:
  Conductor
• Magnetic type:
  ----
• Volume magnetic susceptibility:
  ----
• Mass magnetic susceptibility:
  ----
• Molar magnetic susceptibility:
  ----
• Resistivity:
  1 ⋅ 10^-6 (Ω · m)
• Superconducting point:
  ----

• Debye temperature:
  ----

• Colour:
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• CAS Number:
  CAS7440-14-4
• 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:
  0.9
• Valence electrons:
  2
• Electron affinity:
  9.6485 kJ/mole

• Radioactive:
  Yes
• Half life:
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• Lifetime:
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• Neutron cross section, barn:
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• Universe contains "Radium" at the rate of
  ----
• Sun contains "Radium" at the rate of
  ----
• Oceans contain "Radium" at the rate of
  1.0 ⋅ 10^-13%
• Human body contains "Radium" at the rate of
  4.0 ⋅ 10^-14%
• The Earth's crust consists of "Radium" at the rate of
  9.0 ⋅ 10^-11%
• Meteorites consist of "Radium" at the rate of
  ----