Template:Infobox hydrogen

Hydrogen, ₁H
	Template:Infobox element/symbol-to-top-image-caption
General properties
Pronunciation	Template:Infobox element/pronunciation
Appearance	colorless gas
Standard atomic weight (Ar, standard)	Template:Infobox element/standard atomic weight
Mass number	Template:Infobox element/symbol-to-most-stable-isotope (most stable isotope)
Hydrogen in the periodic table
	Template:Infobox element/periodic table
Atomic number (Z)	1
Group	Template:Infobox element/group
Period	period 1
Block	s-block
Element category	Template:Infobox element/category format
Electron configuration	1s1
Electrons per shell	1
Physical properties
Phase at STP	gas
Melting point	13.99 K (−259.16 °C, −434.49 °F)
Boiling point	20.271 K (−252.879 °C, −423.182 °F)
Density (at STP)	0.08988 g/L
when liquid (at m.p.)	0.07 g/cm3 (solid: 0.0763 g/cm3)
when liquid (at b.p.)	0.07099 g/cm3
Triple point	13.8033 K, 7.041 kPa
Critical point	32.938 K, 1.2858 MPa
Heat of fusion	(H2) 0.117 kJ/mol
[[Enthalpy of vaporization\|Heat of Template:Engvar]]	(H2) 0.904 kJ/mol
Molar heat capacity	(H2) 28.836 J/(mol·K)
	[[Vapor pressure\|Template:Engvar pressure]] Template:Infobox element/vapor pressure table
Atomic properties
Oxidation states	Template:Infobox element/symbol-to-oxidation-state
Electronegativity	Pauling scale: 2.20
[[Ionization energy\|Template:Engvar energies]]	1st: 1312.0 kJ/mol ; ;
Covalent radius	31±5 pm
Van der Waals radius	120 pm
	Template:Infobox element/spectral lines
Other properties
Crystal structure	Template:Infobox element/crystal structure Template:Infobox element/crystal structure
Speed of sound	1310 m/s (gas, 27 °C)
Thermal conductivity	0.1805 W/(m·K)
Magnetic ordering	diamagnetic
Magnetic susceptibility	−3.98·10−6 cm3/mol (298 K)
CAS Number	12385-13-6 ; 1333-74-0 (H2)
History
Discovery	Henry Cavendish (1766)
Named by	Antoine Lavoisier (1783)
Main isotopes of hydrogen
	Template:Infobox element/isotopes table
	view; talk; edit; \| references

Template:Infobox element/element navigation Template:Template reference list Three of these references are named references. They may be cited in the containing articles as

<ref name="Nostrand" /> for the source from Van Nostrand's Encyclopedia
<ref name="nbb" /> for the source from Nature's Building Blocks
<ref name="Stwertka" /> for the source from A Guide to the Elements

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↑ Wiberg, Egon; Wiberg, Nils; Holleman, Arnold Frederick (2001). Inorganic chemistry. Academic Press. p. 240. ISBN 978-0123526519.
↑ Lide, D. R., ed. (2005). "Magnetic susceptibility of the elements and inorganic compounds". CRC Handbook of Chemistry and Physics (PDF) (86th ed.). Boca Raton (FL): CRC Press. ISBN 978-0-8493-0486-6.
↑ Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 978-0-8493-0464-4.
↑ "Hydrogen". Van Nostrand's Encyclopedia of Chemistry. Wylie-Interscience. 2005. pp. 797–799. ISBN 978-0-471-61525-5.
↑ Emsley, John (2001). Nature's Building Blocks. Oxford: Oxford University Press. pp. 183–191. ISBN 978-0-19-850341-5.
↑ Stwertka, Albert (1996). A Guide to the Elements. Oxford University Press. pp. 16–21. ISBN 978-0-19-508083-4.

[1] Wiberg, Egon; Wiberg, Nils; Holleman, Arnold Frederick (2001). Inorganic chemistry. Academic Press. p. 240. ISBN 978-0123526519.

[2] Lide, D. R., ed. (2005). "Magnetic susceptibility of the elements and inorganic compounds". CRC Handbook of Chemistry and Physics (PDF) (86th ed.). Boca Raton (FL): CRC Press. ISBN 978-0-8493-0486-6.

[3] Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 978-0-8493-0464-4.

[Nostrand-4] "Hydrogen". Van Nostrand's Encyclopedia of Chemistry. Wylie-Interscience. 2005. pp. 797–799. ISBN 978-0-471-61525-5.

[nbb-5] Emsley, John (2001). Nature's Building Blocks. Oxford: Oxford University Press. pp. 183–191. ISBN 978-0-19-850341-5.

[Stwertka-6] Stwertka, Albert (1996). A Guide to the Elements. Oxford University Press. pp. 16–21. ISBN 978-0-19-508083-4.

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