Strontium
Lát'ọwọ́ Wikipedia, ìwé ìmọ̀ ọ̀fẹ́
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| Ìfarahàn |
silvery white metallic
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| Àwọn ìní àníkárí |
| Orúkọ, àmì-ìdámọ̀, nọ́mbà |
strontium, Sr, 38 |
| Ìpè |
/ˈstrɒnʃiəm/
STRON-shee-əm;
/ˈstrɒntiəm/
STRON-tee-əm;
/ˈstrɒnʃəm/ STRON-shəm |
| Ẹ̀ka apilẹ̀sẹ̀ |
alkaline earth metal |
| Àdìpọ̀, ìgbà, block |
2, 5, s |
| Ìwúwo átọ́mù |
87.62 g·mol−1 |
| Ìtòjọ ẹ̀lẹ́ktrónì |
[Kr] 5s2 |
| Àwọn ẹ̀lẹ́ktrónì lórí ọ̀nà kan |
2, 8, 18, 8, 2 (Image) |
| Àwọn ìní aláfójúrí |
| Phase |
solid |
| Kíki (tó súnmọ́ r.t.) |
2.64 g·cm−3 |
| Liquid density at m.p. |
2.375 g·cm−3 |
| ojúàmì ìyọ́ |
1050 K, 777 °C, 1431 °F |
| ajúàmì ìhó |
1655 K, 1382 °C, 2520 °F |
| Heat of fusion |
7.43 kJ·mol−1 |
| Heat of vaporization |
136.9 kJ·mol−1 |
| Specific 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 |
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| Atomic properties |
| Oxidation states |
2, 1[1] (strongly basic oxide) |
| Electronegativity |
0.95 (Pauling scale) |
| Ionization energies |
1st: 549.5 kJ·mol−1 |
| 2nd: 1064.2 kJ·mol−1 |
| 3rd: 4138 kJ·mol−1 |
| Atomic radius |
215 pm |
| Covalent radius |
195±10 pm |
| Van der Waals radius |
249 pm |
| Miscellanea |
| Crystal structure |
face-centered cubic |
| Magnetic ordering |
paramagnetic |
| Electrical resistivity |
(20 °C) 132 nΩ·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 |
| Most stable isotopes |
| Main article: Isotopes of strontium |
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