Template:Infobox strontium

Strontium,  ₃₈Sr

General properties
Name, symbol	strontium, Sr
Appearance	silvery white metallic; with a pale yellow tint
Pronunciation	/ˈstrɒnʃⁱəm/ or /ˈstrɒntiəm/ STRON-sh(ee)-əm or STRON-tee-əm
Strontium in the periodic table
Ca ↑ Sr ↓ Ba rubidium ← strontium → yttrium
Atomic number (Z)	38
Group, block	group 2 (alkaline earth metals), s-block
Period	period 5
Element category	alkaline earth metal
Standard atomic weight (±) (Ar)	87.62(1)
Electron configuration	[Kr] 5s2
per shell	2, 8, 18, 8, 2
Physical properties
Phase	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
Heat of vaporization	141 kJ/mol
Molar heat capacity	26.4 J/(mol·K)
vapor 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	2, 1 ​(a strongly basic oxide)
Electronegativity	Pauling scale: 0.95
Ionization 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
Miscellanea
Crystal structure	​face-centered cubic (fcc)
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
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)
Most stable isotopes of strontium
iso NA half-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 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
Decay modes in parentheses are predicted, but have not yet been observed

References

These references will appear in the article, but this list appears only on this page.