Element: Hydrogen (H)

Element NameHydrogen
Physical state at room temperatureGas
Element ClassificationNon-metal
Group NameNone
Group number (Periodic table)1
Period Number (Periodic table) 1
Atomic number1
Atomic Weight1.00794 (Ref: Jlab-ele001)
1.008 (Ref: Lanl-1)
[1.007 84, 1.008 11]  (Ref: Ciaaw-hydrogen, nist-element=1)
Atomic Radius120 pm (Van der Waals) (Ref: Lanl-1)
Density0.00008988 g/cm3 (Ref: Jlab-ele001)
Melting point-259.34°C (Ref: Jlab-ele001)
-259.16 °C (Ref: Lanl-1)
Boiling point-252.87°C (Ref: Jlab-ele001)
-252.879 °C (Ref: Lanl-1)
Electron Shell Configuration1s1
Oxidation States+1, -1 (an amphoteric oxide) (Ref: Jlab-ele001, Lanl-1)
Ionization Energy13.598 eV (Ref: Jlab-ele001)
Number of Stable Isotopes2


  • Jlab-ele001: https://education.jlab.org/itselemental/ele001.html
  • Lanl-1: https://periodic.lanl.gov/1.shtml 
  • Ciaaw-hydrogen: https://www.ciaaw.org/hydrogen.htm  
  • nist-element=1: https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=1
  • Pubchem-Hydrogen : https://pubchem.ncbi.nlm.nih.gov/element/Hydrogen

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