Talk:PowerPedia:Hydrogen
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- Amory Lovins
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Reddi 10:25, 18 Aug 2006 (EDT)
General Name, Symbol, Number hydrogen, H, 1 Chemical series nonmetals Group, Period, Block 1, 1, s Appearance colorless Atomic mass 1.00794(7). g/mol Electron configuration 1s1 Electrons per shell: 1 Physical properties Phase: gas Density (0 °C, 101.325 kPa) 0.08988 g/L Melting point 14.01 K (−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 Atomic properties 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 Miscellaneous Magnetic ordering ??? 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 Notable isotopes 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
Reddi 10:25, 18 Aug 2006 (EDT)
