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|
Strontium
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| Sr | 38 | 87.62 | 777 °C | 1382 °C | Solid | 2.64 g/cm3 | Alkaline Earth Metal  |
|
|
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| General |
| Name, Symbol, Number |
strontium, Sr, 38 |
| Chemical series |
alkaline earth metals |
| Group, Period, Block |
2, 5, s |
| Appearance |
silvery white metallic
 |
| Standard atomic weight |
87.62(1) g·mol−1 |
| Electron configuration |
[Kr] 5s2 |
| Electrons per shell |
2, 8, 18, 8, 2 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
2.64 g·cm−3 |
| Liquid density at m.p. |
2.375 g·cm−3 |
| Melting point |
1050 K
(777 °C, 1431 °F) |
| Boiling point |
1655 K
(1382 °C, 2520 °F) |
| Heat of fusion |
7.43 kJ·mol−1 |
| Heat of vaporization |
136.9 kJ·mol−1 |
| Heat capacity |
(25 °C) 26.4 J·mol−1·K−1 |
Vapor pressure
| P(Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T(K) |
796 |
882 |
990 |
1139 |
1345 |
1646 |
|
| Atomic properties |
| Crystal structure |
cubic face centered |
| Oxidation states |
2
(strongly basic oxide) |
| Electronegativity |
0.95 (scale Pauling) |
Ionization energies
(more) |
1st: 549.5 kJ·mol−1 |
| 2nd: 1064.2 kJ·mol−1 |
| 3rd: 4138 kJ·mol−1 |
| Atomic radius |
200 pm |
| Atomic radius (calc.) |
219 pm |
| Covalent radius |
192 pm |
| Miscellaneous |
| Magnetic ordering |
paramagnetic |
| Electrical resistivity |
(20 °C) 132 n Ω·m |
| Thermal conductivity |
(300 K) 35.4 W·m−1·K−1 |
| Thermal expansion |
(25 °C) 22.5 µm·m−1·K−1 |
| Shear modulus |
6.1 GPa |
| Poisson ratio |
0.28 |
| Mohs hardness |
1.5 |
| CAS registry number |
7440-24-6 |
| Selected isotopes |
|
|
| References |
|
Strontium Compounds
|
Source: Wikipedia article Strontium
|
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Chemistry Quick Facts
