Template:Infobox hydrogen

Hydrogen, ₁H
	Purpie glow in its plasma state
Hydrogen
Appearance	colorless gas
Standard atomic weight Ar, std(H)	[1.00784, 1.00811] conventional: 1.008
Hydrogen in the periodic cairt
	– ← hydrogen → helium
Atomic nummer (Z)	1
Group	group 1
Period	period 1
Block	s-block
Element category	Reactive nonmetal
Electron confeeguration	1s1
Electrons per shell	1
Pheesical properties
Colour	colorless
Phase at STP	gas
Meltin pynt	13.99 K (−259.16 °C, −434.49 °F)
Bylin pynt	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 (solit: 0.0763 g/cm3)
whan liquid (at b.p.)	0.07099 g/cm3
Treeple pynt	13.8033 K, 7.041 kPa
Creetical pynt	32.938 K, 1.2858 MPa
Heat o fusion	(H2) 0.117 kJ/mol
Heat o vapourisation	(H2) 0.904 kJ/mol
Molar heat capacity	(H2) 28.836 J/(mol·K)
Atomic properties
Oxidation states	−1, +1 (an amphoteric oxide)
Electronegativity	Pauling scale: 2.20
Ionisation energies	1st: 1312.0 kJ/mol ; ;
Covalent radius	31±5 pm
Van der Waals radius	120 pm
	Colour lines in a spectral rangeSpectral lines o hydrogen
Ither properties
Naitural occurrence	primordial
Creestal structur	hexagonal
Speed o soond	1310 m/s (gas, 27 °C)
Thermal conductivity	0.1805 W/(m·K)
Magnetic orderin	diamagnetic
Magnetic susceptibility	−3.98·10−6 cm3/mol (298 K)
CAS Nummer	12385-13-6 ; 1333-74-0 (H2)
History
Diskivery	Henry Cavendish (1766)
Named by	Antoine Lavoisier (1783)
Main isotopes o hydrogen
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style="text-align:left"\| data m.p. cat v
	in	calc from C	diff	report	ref
C	−259.16	—	—
K	13.99	13.99	0
F	−434.49	−434.49	0
WD	-259.14 !-259.14 Celsius				^[8]
input	C: −259.16, K: 13.99, F: −434.49
comment

style="text-align:left"\| data b.p. cat v
	in	calc from C	diff	report	ref
C	−252.879	—	—
K	20.271	20.271	0
F	−423.182	−423.182	0
WD	-252.87 !-252.87 Celsius				^[8]
input	C: −252.879, K: 20.271, F: −423.182
comment

PTHydrogen

	^iso ₁H E infobox E isobox	→ He
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References