Periodic Table of Elements showing Gases


Atomic Number1
Molar Mass1.0079 gmol-1
Electron Configuration1s1
Normal Stategas/nonmetal
Density @STP0.09x10-3 g cm-3
Melting Point-259oC
Boiling Point-253oC
Stable Isotopes1H, 2H
Atomic Radius78 pm
Ionic Radius195 (1-) pm
Electronegativity (Pauling)2.2
Ionization Energy (1st)1312 kJ mol-1
Ionization Energy (2nd)n/a kJ mol-1
Ionization Energy (3rd)n/a kJ mol-1
Molar Heat Capacity20.8 J K-1mol-1
Standard Molar Entropy114.7 J K-1mol-1
Enthalpy of Fusion0.12 kJ mol-1
Enthalpy of Vapourization0.46 kJ mol-1
[Back to Periodic table]

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