Strontium

Strontium, ₃₈Sr

Strontium
Pípè	/ˈstrɒnʃiəm,_ʔtiəm/ ​(STRON-shee-əm-,_--tee-əm)
Ìhànsójú	silvery white metallic
Ìwúwo átọ̀mù Ar, std(Sr)	87.62(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 rubidium ← strontium → yttrium
Nọ́mbà átọ̀mù (Z)	38
Ẹgbẹ́	group 2 (alkaline earth metals)
Àyè	àyè 5
Àdìpọ̀	Àdìpọ̀-s
Ẹ̀ka ẹ́límẹ́ntì	Alkaline earth metal
Ìtò ẹ̀lẹ́ktrọ́nù	[Kr] 5s2
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan	2, 8, 18, 8, 2
Àwọn ohun ìní ara
Ìfarahàn at STP	solid
Ìgbà ìyọ́	1050 K ​(777 °C, ​1431 °F)
Ígbà ìhó	1655 K ​(1382 °C, ​2520 °F)
Kíki (near r.t.)	2.64 g/cm3
when liquid (at m.p.)	2.375 g/cm3
Heat of fusion	7.43 kJ/mol
Heat of	136.9 kJ/mol
Molar heat capacity	26.4 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 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment
Electronegativity	Pauling scale: 0.95
Atomic radius	empirical: 215 pm
Covalent radius	195±10 pm
Van der Waals radius	249 pm
Spectral lines of strontium
Other properties
Natural occurrence	primordial
Crystal structure	​(fcc)
Thermal expansion	22.5 µm/(m·K) (at 25 °C)
Thermal conductivity	35.4 W/(m·K)
Electrical resistivity	132 n Ω·m (at 20 °C)
Magnetic ordering	paramagnetic
Shear modulus	6.1 GPa
Poisson ratio	0.28
Mohs hardness	1.5
CAS Number	7440-24-6
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