# Estronsyo

| Strontium |
| --- |
| **38Sr** |
|

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| Ca ↑ **Sr** ↓ Ba |

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Periodic table |

 |  |
|  | rubidium ← **strontium** → yttrium |

 |
| Panagway |
| silvery white metallic  |
| Kinatibuk-ang mga kinaiya |
| Ngalan, simbolo, kaiphan | strontium, Sr, 38 |
| Paglitok | /ˈstrɒnʃⁱəm/ [[Help:Pronunciation respelling key|Plantilya:Smallcaps all**-sh(ee)-əm*]]; /ˈstrɒntiəm/ [[Help:Pronunciation respelling key|Plantilya:Smallcaps all**-tee-əm*]] |
| Kategoriyang elemento | puthaw |
| Group, period, block | 2, 5, s |
| Gibug-aton sa atomo | 87.62 |
| Kontorno sa elektron | [Kr] 5s2 2, 8, 18, 8, 2
Electron shells of strontium (2, 8, 18, 8, 2) |
| History |
| Pagkadiskobre | William Cruickshank   (1787)  |
| First isolation | Humphry Davy   (1808)  |
| Physical properties |
| Phase | magahi |
| 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 |
| Molar heat capacity | 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 |
| Oxidation states | **2**, 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 | 35.4 W·m−1·K−1 |
| Thermal expansion | (25 °C) 22.5 µm·m−1·K−1 |
| Young's modulus | 15.7 GPa |
| Shear modulus | 6.03 GPa |
| Poisson ratio | 0.28 |
| Mohs hardness | 1.5 |
| CAS registry number | 7440-24-6 |
| Most stable isotopes |
| Main article: Isotopes of strontium |
|

| iso | NA | half-life | DM | DE (MeV) | DP |
| --- | --- | --- | --- | --- | --- |
| 82Sr | syn | 25.36 d | ε | - | 82Rb |
| 83Sr | syn | 1.35 d | ε | - | 83Rb |
| β+ | 1.23 | 83Rb |
| γ | 0.76, 0.36 | - |
| 84Sr | 0.56% | 84Sr is stable with 46 neutrons |
| 85Sr | syn | 64.84 d | ε | - | 85Rb |
| γ | 0.514D | - |
| 86Sr | 9.86% | 86Sr is stable with 48 neutrons |
| 87Sr | 7.0% | 87Sr is stable with 49 neutrons |
| 88Sr | 82.58% | 88Sr is stable with 50 neutrons |
| 89Sr | syn | 50.52 d | ε | 1.49 | 89Rb |
| β− | 0.909D | 89Y |
| 90Sr | trace | 28.90 y | β− | 0.546 | 90Y |

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| * v
* t
* e
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Ang **estronsyo** or **estrontyo** (Iningles *strontium*) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga **Sr** ug kaiphan nga atomik 38. Ang estrontyo mao ang puthaw.