Properties of HydrogenThis is a featured page

Properties of Hydrogen - Chemistry with Mr. Olson

  • Name: hydrogen
  • Symbol: H
  • Atomic number: 1
  • Atomic weight: 1.00794 (7) g m r
  • CAS Registry ID: 1333-74-0
  • Group number: 1
  • Group name: (none). While normally shown at the top of the Group 1 elements in the periodic table, the term "alkaline metal" refers only to Group 1 elements from lithium onwards.
  • Period number: 1
  • Block: s-block


  • Phase: Gas
  • Density: 0.8988g/L
  • Melting Point: 14.01k
  • Boiling Point: 20.28k
  • Isotopes Hydrogen has three isotopes: hydrogen-1, hydrogen-2, and hydrogen-3.
Table from: http://en.wikipedia.org/wiki/Hydrogen
General Physical properties Atomic properties Miscellaneous Selected isotopes
Chemical series nonmetals
Group, Period, Block 1, 1, s
Appearance colorless
Atomic mass 1.00794 g/mol
Electron configuration 1s1
Electrons per shell 1
Phase gas
Density (0 °C, 101.325 kPa)
0.08988 g/L
Melting point 14.01K
(−259.14°C, −434.45°F)
Boiling point 20.28 K
(−252.87 °C, −423.17 °F)
Triple point 13.8033 K, 7.042 kPa
Critical point 32.97 K, 1.293 MPa
Heat of fusion (H2) 0.117 kJ·mol−1
Heat of vaporization (H2) 0.904 kJ·mol−1
Heat capacity (25 °C) (H2)
28.836 J·mol−1·K−1
Vapor pressure
P/Pa 1 10 100 1 k 10 k 100 k
at T/K



15 20

Crystal structure hexagonal
Oxidation states 1, −1
(amphoteric oxide)
Electronegativity 2.20 (Pauling scale)
Ionization energies 1st: 1312.0 kJ/mol
Atomic radius 25 pm
Atomic radius (calc.) 53 pm (Bohr radius)
Covalent radius 37 pm
Van der Waals radius 120 pm
Thermal conductivity (300 K) 180.5 mW·m−1·K−1
Speed of sound (gas, 27 °C) 1310 m/s
CAS registry number 1333-74-0
Main article: Isotopes of hydrogen iso NA half-life DM DE (MeV) DP
1H


 99.985%


 H is stable with 0 neutrons
2H


 0.0115%


 H is stable with 1 neutrons
3H


 trace

 12.32 y

 β−

 0.019


 3He










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