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halogen comparison table

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astatine																													halogen
bromine									atmosphere of a planet or asteroid								1 × 108 years					depth indenpendent						-I	accumulating oceanic element		liquid at standard temperature and pressure
chlorine	klor-een	P4/ncm	35.5 barns	31 to 41	20.4033 kJ mol-1	C.W. Scheele	0.0089 W m-1 K-1 for gas at 300 K	1774	in silicate materials such as igneous rocks	chloros = pale green from Greek	6.41 kJ mol-1	Cl2 in small pressurized canisters. Danger!	vast deposits in USA, Poland, Russia, Germany, China, India, Australia	7700 kPa	3.00 - 6.50 g	Cl2 inhalation 500 p.p.m. for 5 minutes for humans	4 × 108 years	halite, carnallite, sylvite	172.17 K	0.95770 × 10-12 cm		depth indenpendent	99 pm	2P3/2 in ground state	a = 856, c = 612 pm	95 g for a 70 kg average person	> 1 × 1013 tonnes	-I	accumulating oceanic element	21.840 J K-1 mol-1 for atomic gas at constant pressure 0.1 MPa at 298.15 K	gas at standard temperature and pressure	181 pm	17.46 cm3 for solid at 113 K	yellow-green, dense, sharp-smelling gas (Cl2) which is a key industrial chemical	239.18 K	Cl2 50 p.p.m. is dangerous even in short doses	chloride, Cl-, is essential to many species, including humans	181 pm for Cl-	35.4527 in units of 12C = 12.000	halite (rock salt)	349.0 kJ mol-1 from Cl to Cl-	7782-50-5 for Chemical Abstracts System database	3.214 kg m-3 for gas at 273 K		17	electrolysis of sodium chloride solution	-7.2 × 10-9 kg-1 m3 for gas	Uppsala, Sweden	13 including nuclear isomers	Cl2 is very toxic affecting the eyes and lungs at 3 p.p.m. in air; chloride is non-toxic	18000 p.p.m. in seawater	858.597 nm for Cl I		chlorine 35	Cl	PVC	tetragonal	168 × 106	[Ne]3s23p5 in ground state	17	11.4 cm2 g-1 for MoKα X-ray diffraction	2000 - 5200 p.p.m. chloride in muscle	3.16 Pauling	417 K
fluorine	floor-een	Pm3n for β-F2	0.0096 barns	17 to 23	6.548 kJ mol-1	H. Moissan	0.0279 W m-1 K-1 at 300 K	1886 (isolated)	ocean	fluere = to flow from Latin	5.10 kJ mol-1	not available for sale as pure gas because it is too reactive and dangerous	Canada, USA, UK, Russia, Mexico, Italy	5573 kPa	0.3 - 0.5 mg	5 - 25 g NaF	400000 years	apatite, cryolite, fluorite	53.53 K	0.5654 × 10-12 cm		depth indenpendent	58 pm	2P3/2 in ground state	a = 667 pm for β-F2	2.6 g for a 70 kg average person	123 × 106 tonnes	-I	accumulating oceanic element	22.744 J K-1 mol-1 for atomic gas at constant pressure 0.1 MPa at 298.15 K	gas at standard temperature and pressure	135 pm	18.05 cm3	pale yellow gas (F2) which is the most reactive of all the elements, and is the strongest oxidizing agent	85.01 K	organic fluorides are often quite harmless	essential in trace quantities for mammals, including humans, in the form of fluoride (F-)	133 pm for F-	18.9984032 in units of 12C = 12.000	fluorite	328 kJ mol-1 from F to F-	7782-41-4 for Chemical Abstracts System database	1.696 kg m-3 for gas at 273 K	70.9 pm	9	electrolysis of molten KF·2HF		Paris, France	7 including nuclear isomers	250 mg NaF	0.4 × 10-4 p.p.m. in deep Pacific seawater	712.789 nm for F I	almost everything violently	fluorine 19	F	AlF3 in aluminium production	cubic for β-F2	4.7 × 106 tonnes year-1 for fluorite (CaF2)	[He]2s22p5 in ground state	9	1.80 cm2 g-1 for MoKalpha X-ray diffraction	0.05 p.p.m. in muscle	3.98 Pauling	144.3 K
iodine									atmosphere of a planet or asteroid								300000 years					increasing with depth						V	recycled oceanic element

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