Strontium

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Strontium, 38Sr
Strontium.jpg
Strontium
Pípè /ˈstrɒnʃiəm,_ʔtiəm/ (STRON-shee-əm-,_--tee-əm)
Ìhànsójúsilvery white metallic
Ìwúwo átọ̀mù Ar, std(Sr)87.62(1)[1]
Strontium ní orí tábìlì àyè
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson
Ca

Sr

Ba
rubidiumstrontiumyttrium
Nọ́mbà átọ̀mù (Z)38
Ẹgbẹ́group 2 (alkaline earth metals)
Àyèàyè 5
Àdìpọ̀Àdìpọ̀-s
Ẹ̀ka ẹ́límẹ́ntì  Alkaline earth metal
Ìtò ẹ̀lẹ́ktrọ́nù[Kr] 5s2
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan2, 8, 18, 8, 2
Àwọn ohun ìní ara
Ìfarahàn at STPsolid
Ìgbà ìyọ́1050 K ​(777 °C, ​1431 °F)
Ígbà ìhó1655 K ​(1382 °C, ​2520 °F)
Kíki (near r.t.)2.64 g/cm3
when liquid (at m.p.)2.375 g/cm3
Heat of fusion7.43 kJ/mol
Heat of 136.9 kJ/mol
Molar heat capacity26.4 J/(mol·K)
 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+1,[2] +2 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment
ElectronegativityPauling scale: 0.95
Atomic radiusempirical: 215 pm
Covalent radius195±10 pm
Van der Waals radius249 pm
Color lines in a spectral range
Spectral lines of strontium
Other properties
Natural occurrenceprimordial
Crystal structure ​(fcc)
Face-centered cubic crystal structure for strontium
Thermal expansion22.5 µm/(m·K) (at 25 °C)
Thermal conductivity35.4 W/(m·K)
Electrical resistivity132 n Ω·m (at 20 °C)
Magnetic orderingparamagnetic
Shear modulus6.1 GPa
Poisson ratio0.28
Mohs hardness1.5
CAS Number7440-24-6
Main isotopes of strontium
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct
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
Àdàkọ:Category-inline
| references


Itokasi[àtúnṣe | àtúnṣe àmìọ̀rọ̀]

  1. Meija, Juris; Coplen, Tyler B.; Berglund, Michael; Brand, Willi A.; De Bièvre, Paul; Gröning, Manfred; Holden, Norman E.; Irrgeher, Johanna 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. 
  2. Colarusso, P.; Guo, B.; Zhang, K.-Q.; Bernath, P. F. (1996). "High-Resolution Infrared Emission Spectrum of Strontium Monofluoride". J. Molecular Spectroscopy 175 (1): 158. Bibcode 1996JMoSp.175..158C. doi:10.1006/jmsp.1996.0019. http://bernath.uwaterloo.ca/media/149.pdf. 
  3. P. Colarusso et al. (1996). "High-Resolution Infrared Emission Spectrum of Strontium Monofluoride". J. Molecular Spectroscopy 175: 158. http://bernath.uwaterloo.ca/media/149.pdf.