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

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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 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

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

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
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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