Mendeleev's Periodic Table > Kr - Krypton

Kr - Krypton

The rare gas krypton (and neon, xenon and radon.) was extracted by William Ramsey and M. W. Travers from liquid air in 1898. The name krypton means hidden. Known compounds include a hydrate, deuteride and the difluoride. In 1960 it was internationally agreed that the fundamental unit of length, the metre, should be defined as 1 m = 1,650,763.73 wavelengths (in vacuo) of the orange-red line of Kr-33. Under normal conditions krypton is colourless, odourless, fairly expensive gas. Solid krypton is a white crystalline substance with a face-centered cubic structure which is common to all the "rare gases".

Atomic number	-	36		Density	g/L	3	.74
Atomic weight	u	83	.8	Melting point	K	115	.78
Bonding radius	A	1	.12	Boiling point	K	119	.8
Atomic radius	A	1	.03	Heat of vaporization	kJ/mol	9	.029
Ionization Potential	V	13	.999	Heat of fusion	kJ/mol	1	.638
Electronegativity	-	-		Specific heat	J/gK	0	.248
The oxide is unknown.				Crystal are face centered cubic.
Electron config. : [Ar] 3d¹⁰ 4s² 4p⁶

Isotopes of Kr (Krypton):

MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	071 97 msec EC/ECp,10.500 Br-71/Se-70 70.950509	072 17.2 sec EC,5.040 MeV Br-72 71.941921	073 27.0 sec EC/ECp,6.670 Br-73/Se-72 72.938926	074 11.50 min EC,3.140 MeV Br-74 73.933257
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	075 4.3 min EC,4.899 MeV Br-75 74.931035	076 14.8 hr EC,1.311 MeV Br-76 75.925950	077 74.4 min EC,3.064 MeV Br-77 76.924669	078 0.35% 2.0E+21 yr ,3.574 MeV 77.920388
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	079 35.04 hr EC,1.626 MeV Br-79 78.920083	080 2.25% Stable 79.916378	081 2.29E+5 yr EC,1.688 MeV Br-81 80.916592	082 11.6% Stable 81.913484
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	083 11.5% Stable 82.914136	084 57.0% Stable 83.911507	085 3934.4 da B-,2.870 MeV Rb-85 84.912529	086 17.3% Stable 85.910615
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	087 76.3 min B-,3.887 MeV Rb-87 86.913358	088 2.84 hr B-,2.914 MeV Rb-88 87.914451	089 3.15 min B-,4.990 MeV Rb-89 88.917637	090 32.32 sec B-,4.392 MeV Rb-90 89.919527
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	091 8.57 sec B-,6.440 MeV Rb-91 90.923402	092 1.840 sec B-/B-n,5.987 Rb-92/Rb-91 91.926111	093 1.286 sec B-/B-n,8.600 Rb-93/Rb-92 92.931260	094 0.20 sec B-/B-n,7.300 Rb-94/Rb-93 93.934299
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	095 0.78 sec B-,9.800 MeV Rb-95 94.939881	097 150 nsec B-,9.800 MeV Rb-97 97.0