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inert gas comparison table

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argon	ar-gon	Fm3m	argon 40	0.675 barns	32 to 46	6.53 kJ mol-1	Lord Rayleigh and Sir William Ramsay	0.0177 W m-1 K-1 at 300 K for gas	1894	argos = inactive from Greek	2.21 kJ mol-1	available in small pressurized canisters. Safe.	4862 kPa	very low	non-toxic	28000 years	none	83.78 K	0.1909 × 10-12 cm		1S0 in ground state	a = 531.088 pm	very small for a 70 kg average person	6.6 × 1013 tonnes in atmosphere	20.786 J K-1 mol-1 for gas at constant pressure 0.1 MPa at 298.15 K	191 pm	24.12 cm3 at 40 K	colourless, odourless gas comprising 1% of the atmosphere	87.29 K	can asphyxiate if it excludes oxygen from the lungs	none	39.948 in units of 12C = 12.000	lquid air	-35 kJ mol-1 from Ar to Ar-	7440-37-1 for Chemical Abstracts System database	1.784 kg m-3 for gas at 273 K	174 pm	18	extracted from the atmosphere by liquefaction	-6.16 × 10-9 kg-1 m3 for gas	London and Bristol, England	15	non-toxic	9300 p.p.m. in atmopshere	965.7786 nm for Ar I	nothing		Ar	inert atmosphere in lamps and high temperature metallurgy	f.c.c	700000 tonnes per year	[Ne]3s23p6 in ground state	18	13.5 cm2 g-1 for MoKα X-ray diffraction	trace amounts in blood	150.87 K
helium	heel-iuhm	Im3m for γ-He at 1.73 K, 2.94 MPa	helium 3, helium 4	0.007 barns	3 to 8 except 7	0.082 kJ mol-1	Norman Lockyer and Edward Frankland	0.152 W m-1 K-1 at 300 K	1868	helios = sun from Greek	0.021 kJ mol-1	small pressurized canisters. Safe.	229 kPa	very low	non-toxic	unknown	present in some minerals	0.95 K under pressure	0.326 × 10-12 cm		1S0 in ground state	a = 411 pm for γ-He at 1.73 K, 2.94 MPa	very small for a 70 kg average person	3.7 × 109 tonnes in Earth's atmosphere	20.786 J K-1 mol-1 for gas at constant pressure 0.1 MPa at 298.15 K	120 pm	32.07 cm3 at 4 K		4.216 K	harmless but could asphyxiate if it excludes oxygen from the lungs	none	4.005602 in units of 12C = 12.000	natural gas which may contain up to 7% helium	0.0 kJ mol-1 from to -	7440-59-7 for Chemical Abstracts System database	0.1785 kg m-3 for gas at 273 K	128 pm	2		-5.9 × 10-9 kg-1 m3 for gas	England	5 including nuclear isomers	non-toxic	4 × 10-6 p.p.m. in seawater	2058.130 nm for He I	nothing	helium 4	He	deep-sea diving, weather baloons, low temperature research	b.c.c. for γ-He at 1.73 K, 2.94 MPa	4500 tonnes year-1	1s2 = [He] in ground state	2	0.207 cm2 g-1 for MoKα X-ray diffraction	traces	5.25 K
krypton																unknown
neon	nee-on	Fm3m		0.040 barns	17 to 25	1.736 kJ mol-1	Sir William Ramsay and M.W. Travers	0.0493 W m-1 K-1 for gas at 300 K	1898	neon = new from Greek	0.324 kJ mol-1	small pressurized canisters. Safe.	2721 kPa	low		unknown	none	24.48 K	× 10-12 cm		1S0 in ground state	a = 445.462 pm	tiny for a 70 kg average person	6.5 × 1010 tonnes in atmosphere	20.786 J K-1 mol-1 for gas at constant pressure 0.1 MPa at 298.15 K	160 pm	13.97 cm3	colourless, odourless gas	27.10 K	harmless gas, although it could asphyxiate if it excluded oxygen from the lungs	none	20.1797 in units of 12C = 12.000	liquid air	-29 kJ mol-1 from Ne to Ne-	7440-01-9 for Chemical Abstracts System database	0.89994 kg m-3 for gas at 273 K		10	liquid air	-4.2 × 10-9 kg-1 m3 for solid	London, England	9 including nuclear isomers	non-toxic	2 × 10-4 p.p.m. in seawater	885.387 nm for Be I	nothing	neon 20	Ne	ornamental lighting, neon signs	f.c.c	1 ton year-1	[He]2s22p6 in ground state	10	cm2 g-1 for MoKα X-ray diffraction	nil in muscle	44.5 K
radon																unknown
xenon																unknown

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