Electronic data		Thermal data		Steric data
Shells: 2,8,18,8,2 Orbitals: [Kr] 5s2 Electronegativity: 1.0, 1.0 1. Ionization potential: 5.6948 eV 2. Ionization potential: 11.03 eV 3. Ionization potential: 43.60 eV Oxidation states: 2 Electrical conductivity: 0.0762 10^6		Melting point: 769 °C Boiling point: 1384 °C Specific heat: 0.30 J/gK Heat of fusion: 8.30 kJ/mol Heat of vaporization: 144.0 kJ/mol Thermal conductivity: 0.353 W/cmK		Atomic radius: 2.45 Å Ionic radius: 1.26 Å () Covalent radius: 1.91 Å Atomic volume: 33.7 cm³/mol Density (293 K): 2.6 g/cm³ Crystal structure: Cubic: Face centered

Nuclide	Abundance [%]	Mass	Spin	Halflife	Decay mode	Decay tree
82Sr	0	82	0	25.36d	EC	View
83Sr	0	83	7/2	1.350d	EC,+	View
84Sr	0.56	83.9134	0	--	stable	--
85Sr	0	84.913	9/2	64.84d	EC	View
85Srm	0	85	1/2	1.27h	IT,EC	View
86Sr	9.86	85.9093	0	--	stable	--
87Sr	7.02	86.9089	9/2	--	stable	--
87Srm	0	87	1/2	2.80h	IT,EC	View
88Sr	82.56	87.9056	0	--	stable	--
89Sr	0	88.907	5/2	50.52d	-	View
90Sr	0	89.907	0	29.1y	-	View
91Sr	0	91	5/2	9.50h	-,b-	View
92Sr	0	92	0	2.71h	-	View
93Sr	0	93	5/2	7.4m	-	View

Legend

Name origin:	From the Scottish town, Strontian
Description:	Soft, malleable, silvery-yellow metal.
Discovered by:	A. Crawford
Year:	1790
Place:	Scotland
Sources:	Found in minerals celestite and strontianite.
Use(s):	Used in flares and fireworks for crimson color. Strontium-90 is a long lived highly radioactive fallout product of atomic-bomb explosions.