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[[Category:Template:Pagetype with short description]]
Strontium, 38Sr |
| Strontium |
|---|
| Pronunciation | (Template:Respell) |
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| Appearance | silvery white metallic; with a pale yellow tint[1] |
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| Standard atomic weight Ar, std(Sr) | Template:Val[2] |
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| Strontium in the periodic table |
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|
|
| Atomic number (Z) | 38 |
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| Group | group 2 (alkaline earth metals) |
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| Period | period 5 |
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| Block | s-block |
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| Electron configuration | [Kr] 5s2 |
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| Electrons per shell | 2, 8, 18, 8, 2 |
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| Physical properties |
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| Phase at STP | solid |
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| Melting point | 1050 K (777 °C, 1431 °F) |
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| Boiling point | 1650 K (1377 °C, 2511 °F) |
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| Density (near r.t.) | 2.64 g/cm3 |
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| when liquid (at m.p.) | 2.375 g/cm3 |
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| Heat of fusion | 7.43 kJ/mol |
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| Heat of vaporization | 141 kJ/mol |
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| Molar heat capacity | 26.4 J/(mol·K) |
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Vapor pressure
| P (Pa)
|
1
|
10
|
100
|
1 k
|
10 k
|
100 k
|
| at T (K)
|
796
|
882
|
990
|
1139
|
1345
|
1646
|
|
| Atomic properties |
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| Oxidation states | +1,[3] +2 (a strongly basic oxide) |
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| Electronegativity | Pauling scale: 0.95 |
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| Ionization energies | - 1st: 549.5 kJ/mol
- 2nd: 1064.2 kJ/mol
- 3rd: 4138 kJ/mol
-
|
|---|
| Atomic radius | empirical: 215 pm |
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| Covalent radius | 195±10 pm |
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| Van der Waals radius | 249 pm |
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| Spectral lines of strontium |
| Other properties |
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| Natural occurrence | primordial |
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| Crystal structure | face-centered cubic (fcc) |
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| Thermal expansion | 22.5 µm/(m·K) (at 25 °C) |
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| Thermal conductivity | 35.4 W/(m·K) |
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| Electrical resistivity | 132 nΩ·m (at 20 °C) |
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| Magnetic ordering | paramagnetic |
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| Magnetic susceptibility | −92.0·10−6 cm3/mol (298 K)[4] |
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| Young's modulus | 15.7 GPa |
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| Shear modulus | 6.03 GPa |
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| Poisson ratio | 0.28 |
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| Mohs hardness | 1.5 |
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| CAS Number | 7440-24-6 |
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| History |
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| Naming | after the mineral strontianite, itself named after Strontian, Scotland |
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| Discovery | William Cruickshank (1787) |
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| First isolation | Humphry Davy (1808) |
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| Main isotopes of strontium |
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|
|
Category: Strontium | references |
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References
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