Chlorine was used as a weapon in World War I.

Cl - Chlorine

A green, highly reactive gas, chlorine is the most abundant halogen, comprising nearly two percent of the seas and used in all of our laboratory classes. Karl Scheele discovered chlorine in 1774, but believed it to be an oxide of a ficticous element, murium (which is why hydrochloric acid is also known as muriatic acid.) Murium was never found, but Humphrey Davy recognized it's elemental quality in 1810.

Atomic number - 17 Density g/mL 0 .000317

Atomic weight u 35 .453 Melting point K 172 .16

Bonding radius A 0 .99 Boiling point K 239 .1

Atomic radius A 0 .97 Heat of vaporization kJ/mol 10 .2

Ionization Potential V 12 .967 Heat of fusion kJ/mol 3 .203

Electronegativity - 3 .16 Specific heat J/gK 0 .48

The oxide is a strong acid.
Crystal are orthorhombic.

Electron config. : [Ne] 3s² 3p⁵

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

H He

Li Be B C N O F Ne

Na Mg Al Si P S Cl Ar

K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr

Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe

Cs Ba La* Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn

Fr Ra Ac** Rf Db Sg Bh Hs Mt 110 111 112 113

Lanthanides* Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu

Actinides ** Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr

Isotopes of Cl: Click mass number for decay process, product for element page.

031
150 msec
EC/ECp,11.980
S-31/P-30
30.992420 032
298 msec
EC/ECa/ECp,12.685
S-32/Si-28/P-31
31.985688 033
2.511 sec
EC,5.583 MeV
S-33
32.977451 034
1.5264 sec
EC,5.492 MeV
S-34
33.973763 035 75.77%

Stable

34.968852 036
3.01E+5 yr
B-/EC,10.413
Ar-36/S-36
35.968306 037 24.23%

Stable

36.965902

038
37.24 min
B-,4.917 MeV
Ar-38
37.968010 039
55.6 min
B-,3.442 MeV
Ar-39
38.968008 040
1.35 min
B-,7.480 MeV
Ar-40
39.970413 041
38.4 sec
B-,5.730 MeV
Ar-41
40.970649 042
6.8 sec
B-,9.430 MeV
Ar-42
41.973172 043
3.3 sec
B-,7.950 MeV
Ar-43
42.974202 044
0.43 sec
B-/B-n,3.920
Ar-44/Ar-43
43.978539

045
400 msec
B-/B-n,10.800
Ar-45/Ar-44
44.979710 046
0.22 sec
B-/B-n,6.900
Ar-46/Ar-45
45.984111 047
200 nsec
B-/B-n,14.700
Ar-47/Ar-46
46.987976 MASS abund.
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass

Updated by clh on 2/6/98. This is not a publication of Phoenix College.

Atomic number	-	17		Density	g/mL	0	.000317
Atomic weight	u	35	.453	Melting point	K	172	.16
Bonding radius	A	0	.99	Boiling point	K	239	.1
Atomic radius	A	0	.97	Heat of vaporization	kJ/mol	10	.2
Ionization Potential	V	12	.967	Heat of fusion	kJ/mol	3	.203
Electronegativity	-	3	.16	Specific heat	J/gK	0	.48
The oxide is a strong acid.				Crystal are orthorhombic.
Electron config. : [Ne] 3s² 3p⁵
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031 150 msec EC/ECp,11.980 S-31/P-30 30.992420	032 298 msec EC/ECa/ECp,12.685 S-32/Si-28/P-31 31.985688	033 2.511 sec EC,5.583 MeV S-33 32.977451	034 1.5264 sec EC,5.492 MeV S-34 33.973763	035 75.77% Stable 34.968852	036 3.01E+5 yr B-/EC,10.413 Ar-36/S-36 35.968306	037 24.23% Stable 36.965902
038 37.24 min B-,4.917 MeV Ar-38 37.968010	039 55.6 min B-,3.442 MeV Ar-39 38.968008	040 1.35 min B-,7.480 MeV Ar-40 39.970413	041 38.4 sec B-,5.730 MeV Ar-41 40.970649	042 6.8 sec B-,9.430 MeV Ar-42 41.973172	043 3.3 sec B-,7.950 MeV Ar-43 42.974202	044 0.43 sec B-/B-n,3.920 Ar-44/Ar-43 43.978539
045 400 msec B-/B-n,10.800 Ar-45/Ar-44 44.979710	046 0.22 sec B-/B-n,6.900 Ar-46/Ar-45 45.984111	047 200 nsec B-/B-n,14.700 Ar-47/Ar-46 46.987976	MASS abund. Halflife Particle, Energy Decay Product(s) Isotopic Mass