Template:Infobox strontium

Strontium,  ₃₈Sr

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General properties
Pronunciation	Template:Infobox element/pronunciation
Appearance	silvery white metallic; with a pale yellow tint
Standard atomic weight (Ar, standard)	Template:Infobox element/standard atomic weight
Mass number	Template:Infobox element/symbol-to-most-stable-isotope (most stable isotope)
Strontium in the periodic table
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Atomic number (Z)	38
Group	Template:Infobox element/group
Period	period 5
Block	s-block
Element category	Template:Infobox element/category format
Electron configuration	[Kr] 5s2
Electrons per shell	2, 8, 18, 8, 2
Physical properties
Phase at STP	solid
Melting point	1050 K ​(777 °C, ​1431 °F)
Boiling point	1650 K ​(1377 °C, ​2511 °F)
Density (near r.t.)	2.64 g/cm3
when liquid (at m.p.)	2.375 g/cm3
Heat of fusion	7.43 kJ/mol
[[Enthalpy of vaporization|Heat of Template:Engvar]]	141 kJ/mol
Molar heat capacity	26.4 J/(mol·K)
[[Vapor pressure|Template:Engvar pressure]] Template:Infobox element/vapor pressure table
Atomic properties
Oxidation states	Template:Infobox element/symbol-to-oxidation-state
Electronegativity	Pauling scale: 0.95
[[Ionization energy|Template:Engvar 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
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Other properties
Crystal structure	​Template:Infobox element/crystal structure Template:Infobox element/crystal structure
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 ordering	paramagnetic
Magnetic susceptibility	−92.0·10−6 cm3/mol (298 K)
Young's modulus	15.7 GPa
Shear modulus	6.03 GPa
Poisson ratio	0.28
Mohs hardness	1.5
CAS Number	7440-24-6
History
Naming	after the mineral strontianite, itself named after Strontian, Scotland
Discovery	William Cruickshank (1787)
First isolation	Humphry Davy (1808)
Main isotopes of strontium
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