Sr - Strontium

An alkaline earth metal. Discovered in 1790 by Crawford in Scotland, and obtained as a metal by Davy in 1807 in London.

Strontium titanate from the gemstone collection of theImage.

Atomic number - 38 Density g/mL 2 .6
Atomic weight u 87 .62 Melting point K 1041
Bonding radius A 1 .91 Boiling point K 1650
Atomic radius A 2 .45 Heat of vaporization kJ/mol 144
Ionization Potential V 5 .695 Heat of fusion kJ/mol 8 .3
Electronegativity - 0 .95 Specific heat J/gK 0 .3
The oxide is a strong base.
Crystal are face centered cubic.

Electron config. : [Kr] 5s2


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


075
150 nsec
EC/ECp,7.020
Rb-75/Kr-74
74.949972
076
8.9 sec
EC,6.100 MeV
Rb-76
75.941599
077
9.0 sec
EC/ECp,6.850
Rb-77/Kr-76
76.937766
078
2.5 min
EC,3.762 MeV
Rb-78
77.932182
079
2.25 min
EC,5.318 MeV
Rb-79
78.929709
080
106.3 min
EC,1.868 MeV
Rb-80
79.924527
081
22.3 min
EC,3.930 MeV
Rb-81
80.923213
082
25.55 da
EC,4.469 MeV
Rb-82
81.918401
083
32.41 hr
EC,2.276 MeV
Rb-83
82.917555
084 0.56%

Stable

83.913426
085
64.84 da
EC,1.065 MeV
Rb-85
84.912935
085a
67.63 min
EC,1.304 MeV
Rb-85
84.913192
086 9.86%

Stable

85.909264
087 7.00%

ECStable
Rb-87
86.908879
088 82.58%

Stable

87.905616
089
50.53 da
B-,1.495 MeV
Y-89
88.907453
090
28.78 yr
B-,6.697 MeV
Y-90
89.907738
091
9.63 hr
B-,2.699 MeV
Y-91
90.910199
092
2.71 hr
B-,1.911 MeV
Y-92
91.910981
093
7.423 min
B-,4.137 MeV
Y-93
92.914022
094
75.3 sec
B-,3.511 MeV
Y-94
93.915365
095
23.90 sec
B-,6.080 MeV
Y-95
94.919313
096
1.07 sec
B-,5.371 MeV
Y-96
95.921649
097
429 msec
B-/B-n,7.467
Y-97/Y-96
96.926145
098
0.653 sec
B-/B-n,5.826
Y-98/Y-97
97.928491
099
0.269 sec
B-/B-n,8.030
Y-99/Y-98
98.933257
100
202 msec
B-/B-n,7.080
Y-100/Y-99
99.935351
101
118 msec
B-/B-n,9.510
Y-101/Y-100
100.94051
102
69 msec
B-/B-n,8.820
Y-102/Y-101
101.94301
MASS abund.
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass