Strontium

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Strontium,  38Sr
Strontium destilled crystals.jpg
General properties
Name, seembol strontium, Sr
Appearance sillery white metallic; wi a fauch yellae tint[1]
Pronunciation /ˈstronteəm/ or /ˈstronʃ(e)əm/
STRON-tee-əm or STRON-sh(ee)-əm
Strontium in the periodic cairt
Hydrogen (diatomic nonmetal)
Helium (noble gas)
Lithium (alkali metal)
Beryllium (alkaline yird metal)
Boron (metalloid)
Carbon (polyatomic nonmetal)
Nitrogen (diatomic nonmetal)
Oxygen (diatomic nonmetal)
Fluorine (diatomic nonmetal)
Neon (noble gas)
Sodium (alkali metal)
Magnesium (alkaline yird metal)
Aluminium (post-transeetion metal)
Silicon (metalloid)
Phosphorus (polyatomic nonmetal)
Sulfur (polyatomic nonmetal)
Chlorine (diatomic nonmetal)
Argon (noble gas)
Potassium (alkali metal)
Calcium (alkaline yird metal)
Scandium (transeetion metal)
Titanium (transeetion metal)
Vanadium (transeetion metal)
Chromium (transeetion metal)
Manganese (transeetion metal)
Airn (transeetion metal)
Cobalt (transeetion metal)
Nickel (transeetion metal)
Capper (transeetion metal)
Zinc (transeetion metal)
Gallium (post-transeetion metal)
Germanium (metalloid)
Arsenic (metalloid)
Selenium (polyatomic nonmetal)
Bromine (diatomic nonmetal)
Krypton (noble gas)
Rubidium (alkali metal)
Strontium (alkaline yird metal)
Yttrium (transeetion metal)
Zirconium (transeetion metal)
Niobium (transeetion metal)
Molybdenum (transeetion metal)
Technetium (transeetion metal)
Ruthenium (transeetion metal)
Rhodium (transeetion metal)
Palladium (transeetion metal)
Siller (transeetion metal)
Cadmium (transeetion metal)
Indium (post-transeetion metal)
Tin (post-transeetion metal)
Antimony (metalloid)
Tellurium (metalloid)
Iodine (diatomic nonmetal)
Xenon (noble gas)
Caesium (alkali metal)
Barium (alkaline yird metal)
Lanthanum (lanthanide)
Cerium (lanthanide)
Praseodymium (lanthanide)
Neodymium (lanthanide)
Promethium (lanthanide)
Samarium (lanthanide)
Europium (lanthanide)
Gadolinium (lanthanide)
Terbium (lanthanide)
Dysprosium (lanthanide)
Holmium (lanthanide)
Erbium (lanthanide)
Thulium (lanthanide)
Ytterbium (lanthanide)
Lutetium (lanthanide)
Hafnium (transeetion metal)
Tantalum (transeetion metal)
Tungsten (transeetion metal)
Rhenium (transeetion metal)
Osmium (transeetion metal)
Iridium (transeetion metal)
Platinum (transeetion metal)
Gold (transeetion metal)
Mercur (transeetion metal)
Thallium (post-transeetion metal)
Leid (post-transeetion metal)
Bismuth (post-transeetion metal)
Polonium (post-transeetion metal)
Astatine (metalloid)
Radon (noble gas)
Francium (alkali metal)
Radium (alkaline yird metal)
Actinium (actinide)
Thorium (actinide)
Protactinium (actinide)
Uranium (actinide)
Neptunium (actinide)
Plutonium (actinide)
Americium (actinide)
Curium (actinide)
Berkelium (actinide)
Californium (actinide)
Einsteinium (actinide)
Fermium (actinide)
Mendelevium (actinide)
Nobelium (actinide)
Lawrencium (actinide)
Rutherfordium (transeetion metal)
Dubnium (transeetion metal)
Seaborgium (transeetion metal)
Bohrium (transeetion metal)
Hassium (transeetion metal)
Meitnerium (unkent chemical properties)
Darmstadtium (unkent chemical properties)
Roentgenium (unkent chemical properties)
Copernicium (transeetion metal)
Ununtrium (unkent chemical properties)
Flerovium (post-transeetion metal)
Ununpentium (unkent chemical properties)
Livermorium (unkent chemical properties)
Ununseptium (unkent chemical properties)
Ununoctium (unkent chemical properties)
Ca

Sr

Ba
rubidiumstrontiumyttrium
Atomic nummer (Z) 38
Group, block group 2 (alkaline yird metals), s-block
Period period 5
Element category   alkaline yird metal
Staundart atomic wicht (±) (Ar) 87.62(1)[2]
Electron configuration [Kr] 5s2
per shell
2, 8, 18, 8, 2
Pheesical properties
Phase solid
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[3] ​(a strangly basic oxide)
Electronegativity Pauling scale: 0.95
Ionisation energies 1st: 549.5 kJ/mol
2nt: 1064.2 kJ/mol
3rd: 4138 kJ/mol
Atomic radius empirical: 215 pm
Covalent radius 195±10 pm
Van der Waals radius 249 pm
Miscellanea
Creestal structur ​face-centred cubic
[[File:face-centred cubic|50px|alt=Face-centred cubic crystal structur for strontium|Face-centred cubic crystal 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)
Maist stable isotopes o strontium
iso NA hauf-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% (β+β+) 1.7867 84Kr
85Sr syn 64.84 d ε 85Rb
γ 0.514D
86Sr 9.86% 86Sr is stable wi 48 neutrons
87Sr 7.0% 87Sr is stable wi 49 neutrons
88Sr 82.58% 88Sr is stable wi 50 neutrons
89Sr syn 50.52 d ε 1.49 89Rb
β 0.909D 89Y
90Sr trace 28.90 y β 0.546 90Y
Decay modes in parentheses are predictit, but hisnae yet been observed
· references

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. Standard Atomic Weights 2013. Commission on Isotopic Abundances and Atomic Weights
  3. 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.