a krypton discharge lamp

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. The red and blue emission lines of krypton are shown to our students.

Atomic number - 36 Density g/mL 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

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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 Kr: Click mass number for decay process, product for element page.

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 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 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 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 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 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 095
0.78 sec
B-,9.800 MeV
Rb-95
94.939881 097
150 nsec
B-,9.800 MeV
Rb-97
97.0 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	-	36		Density	g/mL	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
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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	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	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	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	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	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	095 0.78 sec B-,9.800 MeV Rb-95 94.939881	097 150 nsec B-,9.800 MeV Rb-97 97.0	MASS abund. Halflife Particle, Energy Decay Product(s) Isotopic Mass