Ar - Argon

Argon is an inert gas used for its blue and green lumination of emission. Argonwas found by William Ramsey and Rayleigh in a 1894 experiment in which they removed all of the oxygen and nitrogen from the air.

Atomic number - 18 Density g/mL 0 .0001784

Atomic weight u 39 .948 Melting point K 83 .81

Bonding radius A 0 .98 Boiling point K 87 .3

Atomic radius A 0 .88 Heat of vaporization kJ/mol 6 .447

Ionization Potential V 15 .759 Heat of fusion kJ/mol 1 .188

Electronegativity - - Specific heat J/gK 0 .52

The oxide is unknown.
Crystal are face centered cubic.

Electron config. : [Ne] 3s² 3p⁶

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

032
98 msec
EC/ECp,11.150
Cl-32/S-31
31.997659 033
173.0 msec
EC/ECp,11.620
Cl-33/S-32
32.989930 034
844.5 msec
EC,6.061 MeV
Cl-34
33.980270 035
1.775 sec
EC,5.965 MeV
Cl-35
34.975256 036 0.3365%

Stable

35.967546 037
35.04 da
EC,4.865 MeV
Cl-37
36.966775 038 0.0632%

Stable

37.962732

039
269 yr
B-,3.442 MeV
K-39
38.964313 040 99.6003%

Stable

39.962383 041
109.34 min
B-,2.492 MeV
K-41
40.964500 042
32.9 yr
B-,9.430 MeV
K-42
41.963048 043
5.37 min
B-,4.620 MeV
K-43
42.965668 044
11.87 min
B-,3.550 MeV
K-44
43.965365 045
21.48 sec
B-,6.890 MeV
K-45
44.968094

046
8.4 sec
B-,5.700 MeV
K-46
45.968094 MASS abund.
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass

Atomic number	-	18		Density	g/mL	0	.0001784
Atomic weight	u	39	.948	Melting point	K	83	.81
Bonding radius	A	0	.98	Boiling point	K	87	.3
Atomic radius	A	0	.88	Heat of vaporization	kJ/mol	6	.447
Ionization Potential	V	15	.759	Heat of fusion	kJ/mol	1	.188
Electronegativity	-	-		Specific heat	J/gK	0	.52
The oxide is unknown.				Crystal are face centered cubic.
Electron config. : [Ne] 3s² 3p⁶

032 98 msec EC/ECp,11.150 Cl-32/S-31 31.997659	033 173.0 msec EC/ECp,11.620 Cl-33/S-32 32.989930	034 844.5 msec EC,6.061 MeV Cl-34 33.980270	035 1.775 sec EC,5.965 MeV Cl-35 34.975256	036 0.3365% Stable 35.967546	037 35.04 da EC,4.865 MeV Cl-37 36.966775	038 0.0632% Stable 37.962732
039 269 yr B-,3.442 MeV K-39 38.964313	040 99.6003% Stable 39.962383	041 109.34 min B-,2.492 MeV K-41 40.964500	042 32.9 yr B-,9.430 MeV K-42 41.963048	043 5.37 min B-,4.620 MeV K-43 42.965668	044 11.87 min B-,3.550 MeV K-44 43.965365	045 21.48 sec B-,6.890 MeV K-45 44.968094
046 8.4 sec B-,5.700 MeV K-46 45.968094	MASS abund. Halflife Particle, Energy Decay Product(s) Isotopic Mass