Difference between revisions of "Hydrogen"

Atomic properties
Atomic number	1
Standard atomic weight	1.007 94(7)
Electron configuration	1s1
Physical properties
Melting point	13.957 K (−259.193 °C)
Boiling point	20.39 K (−252.76 °C)
Critical point	33.18 K, 13.00(1) bar
Ionization energy
	13.598 432 44(36) eV; 1305.584 631 kJ mol−1
Thermodynamic properties
Standard entropy	130.680(3) J K−1 mol−1
Enthalpy change of atomization	217.998(6) kJ mol−1
Entropy change of atomization	114.717(2) J K−1 mol−1
Enthalpy change of vaporization	0.904 kJ mol−1
Hazards
GHS pictograms
GHS signal word	DANGER
GHS hazard statements	H220
Miscellaneous
CAS number	1333-74-0
EC number	215-605-7
	Where appropriate, and unless otherwise stated, data are given for 100 kPa (1 bar) and 298.15 K (25 °C).
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Revision as of 16:24, 21 September 2010

– ← hydrogen → helium

–
↑
H
↓
Li

Hydrogen (symbol: H) is a chemical element, the most abundant element in the universe.

See also the corresponding article on Wikipedia.

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@@ Line 14: / Line 14: @@
 |critical-point = 33.18 K, 13.00(1) bar
 |solubility =
-|IE-ref = <ref>{{RubberBible62nd|page=E-65}}.</ref>
+|IE-ref = <ref>{{NBS 34}}.</ref>
-|IE1 = 13.598 eV<br/>1312.0 kJ mol<sup>−1</sup>
+|IE1 = 13.598 432 44(36) eV<br/>1305.584 631 kJ mol<sup>−1</sup>
 |thermo-ref = <ref name="G&E"/><ref>{{CODATA thermo}}.</ref>
 |entropy = 130.680(3) J K<sup>−1</sup> mol<sup>−1</sup>