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Strontium, 38Sr |
| Strontium |
|---|
| Pronunciation | (STRON-shee-əm, -tee-əm) |
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| Appearance | sillery white metallic; wi a fauch yellae tint[1] |
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| Standard atomic weight Ar, std(Sr) | 7001876200000000000♠87.62(1)[2] |
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| Strontium in the periodic cairt |
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|
|
| Atomic nummer (Z) | 38 |
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| Group | group 2 (alkaline yird metals) |
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| Period | period 5 |
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| Block | s-block |
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| Element category | Alkaline yird metal |
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| Electron confeeguration | [Kr] 5s2 |
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| Electrons per shell | 2, 8, 18, 8, 2 |
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| Pheesical properties |
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| Phase at STP | solit |
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| Meltin pynt | 1050 K (777 °C, 1431 °F) |
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| Bylin pynt | 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 o fusion | 7.43 kJ/mol |
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| Heat o vapourisation | 141 kJ/mol |
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| Molar heat capacity | 26.4 J/(mol·K) |
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Vapour pressur
| P (Pa)
|
1
|
10
|
100
|
1 k
|
10 k
|
100 k
|
| at T (K)
|
796
|
882
|
990
|
1139
|
1345
|
1646
|
|
| Atomic properties |
|---|
| Oxidation states | +1,[3] +2 strangly basic |
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| Electronegativity | Pauling scale: 0.95 |
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| Ionisation energies | - 1st: 549.5 kJ/mol
- 2nd: 1064.2 kJ/mol
- 3rd: 4138 kJ/mol
-
|
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| 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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 Colour lines in a spectral rangeSpectral lines o strontium |
| Ither properties |
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| Naitural occurrence | primordial |
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| Creestal structur | face-centred cubic |
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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 orderin | paramagnetic |
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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 haurdness | 1.5 |
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| CAS Nummer | 7440-24-6 |
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| History |
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| Namin | efter the mineral strontianite, itsel named efter Strontian, Scotland |
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| Diskivery | William Cruickshank (1787) |
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| First isolation | Humphry Davy (1808) |
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| Main isotopes o strontium |
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|
|
| Decay modes in parentheses are predictit, but hisnae yet been observed |
| | references |
| style="text-align:left"|
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|
in
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calc from C
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diff
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report
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ref
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| C
|
777
|
—
|
—
|
|
|
| K
|
1050
|
1050
|
0
|
|
|
| F
|
1431
|
1431
|
0
|
|
|
| WD
|
String Module Error: Target string is empty ! 
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|
|
|
| input
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C: 777, K: 1050, F: 1431
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| comment
|
|
| style="text-align:left"|
|
|
|
in
|
calc from C
|
diff
|
report
|
ref
|
| C
|
1377
|
—
|
—
|
|
|
| K
|
1650
|
1650
|
0
|
|
|
| F
|
2511
|
2511
|
0
|
|
|
| WD
|
String Module Error: Target string is empty !
|
|
|
|
| input
|
C: 1377, K: 1650, F: 2511
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| comment
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References
Thir references will appear in the airticle, but this list appears anerly on this page.
- ↑ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth–Heinemann. p. 112. ISBN 0080379419.
- ↑ Meija, Juris; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–91. doi:10.1515/pac-2015-0305.
- ↑ Colarusso, P.; Guo, B.; Zhang, K.-Q.; Bernath, P. F. (1996). "High-Resolution Infrared Emission Spectrum of Strontium Monofluoride" (PDF). J. Molecular Spectroscopy. 175 (1): 158. Bibcode:1996JMoSp.175..158C. doi:10.1006/jmsp.1996.0019.
- ↑ Standard Atomic Weights 2013. Commission on Isotopic Abundances and Atomic Weights
- ↑ Colarusso, P.; Guo, B.; Zhang, K.-Q.; Bernath, P.F. (1996). "High-Resolution Infrared Emission Spectrum of Strontium Monofluoride" (PDF). J. Molecular Spectroscopy. 175: 158. Bibcode:1996JMoSp.175..158C. doi:10.1006/jmsp.1996.0019.
