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2.1 The physical properties of hydrogen

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Physical properties of hydrogen.
Chemical symbol H
Atomic number 1
Electron configuration 1s 1
Atomic weight 1.00794
Melting point -259 °C
Boiling point -253 °C
Density (gas) 0.090 g/L
Density (liquid) 0.070 g/L
Ionization potential 13.598 eV
Pauling electronegativity 2.1
Ionic radius (H - ) 1.54 Å
van der Waal radius 1.2 Å
Explosive limit 4 - 75%
Ignition temperature 585 °C
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Source:  OpenStax, Chemistry of the main group elements. OpenStax CNX. Aug 20, 2010 Download for free at http://cnx.org/content/col11124/1.25
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