Strontium

Frae Wikipedia
Jump to navigation Jump to search
Strontium,  38Sr
Strontium destilled crystals.jpg
General properties
Appearance sillery white metallic; wi a fauch yellae tint[1]
Staundart atomic wecht (Ar, staundart) 87.62(1)
Strontium in the periodic cairt
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 Airn Cobalt Nickel Capper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Siller (element) 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 Mercur (element) Thallium Leid (element) 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 Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium
Ca

Sr

Ba
rubidiumstrontiumyttrium
Atomic nummer (Z) 38
Group group 2 (alkaline yird metals)
Period period 5
Element category   alkaline yird metal
Block s-block
Electron confeeguration [Kr] 5s2
Electrons per shell
2, 8, 18, 8, 2
Pheesical properties
Phase (at STP) solit
Meltin pynt 1050 K ​(777 °C, ​1431 °F)
Bylin pynt 1650 K ​(1377 °C, ​2511 °F)
Density (near r.t.) 2.64 g/cm3
when liquid (at m.p.) 2.375 g/cm3
Heat o fusion 7.43 kJ/mol
Heat o vapourisation 141 kJ/mol
Molar heat capacity 26.4 J/(mol·K)
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 2, 1[2] ​(a strangly basic oxide)
Electronegativity Pauling scale: 0.95
Ionisation energies
  • 1st: 549.5 kJ/mol
  • 2nd: 1064.2 kJ/mol
  • 3rd: 4138 kJ/mol
Atomic radius empirical: 215 pm
Covalent radius 195±10 pm
Van der Waals radius 249 pm
Color lines in a spectral range
Miscellanea
Creestal structur ​face-centred cubic
[[File:face-centred cubic|50px|alt=Face-centred cubic creestal structur for strontium|Face-centred cubic creestal structur for strontium]]
Thermal expansion 22.5 µm/(m·K) (at 25 °C)
Thermal conductivity 35.4 W/(m·K)
Electrical resistivity 132 nΩ·m (at 20 °C)
Magnetic orderin paramagnetic
Young's modulus 15.7 GPa
Shear modulus 6.03 GPa
Poisson ratio 0.28
Mohs haurdness 1.5
CAS Nummer 7440-24-6
History
Namin efter the mineral strontianite, itsel named efter Strontian, Scotland
Diskivery William Cruickshank (1787)
First isolation Humphry Davy (1808)
Main isotopes o strontium
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct
82Sr syn 25.36 d ε 82Rb 83Sr syn 1.35 d ε 83Rb
β+ 83Rb
γ
84Sr 0.56% (β+β+) 84Kr
85Sr syn 64.84 d ε 85Rb
γ
86Sr 9.86% stable
87Sr 7.0% stable
88Sr 82.58% stable
89Sr syn 50.52 d ε 89Rb
β 89Y
90Sr trace 28.90 y β 90Y
Decay modes in parentheses are predictit, but hisnae yet been observed
| references | in Wikidata

Strontium is a chemical element wi seembol Sr an atomic nummer 38.

References[eedit | eedit soorce]

  1. Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth–Heinemann. p. 112. ISBN 0080379419. 
  2. 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. 
  3. Standard Atomic Weights 2013. Commission on Isotopic Abundances and Atomic Weights