Strontium Elemental Symbol

French German Italian Portuguese Spanish Swedish
Strontium Strontium Stronzio Estrôncio Estroncio Strontium

Strontium(Sr) atomic and molecular weight, atomic number and elemental symbolStrontium is a Block S, Group 2, Period 5 element. Elemental StrontiumThe number of electrons in each of Strontium's shells is 2, 8, 18, 8, 2 and its electron configuration is [Kr] 5s2. Strontium Bohr ModelThe strontium atom has a radius of and its Van der Waals radius is In its elemental form, CAS 7440-24-6, strontium has a silvery white metallic appearance. Strontium is found in celestite and strontianite ores. Strontium was discovered by William Cruickshank in 1787 and first isolated by Humphry Davy in 1808. Strontium was named after the Scottish town it was discovered in.

Strontium has low tech applications as an additive to flares and pyrotechnics because of the bright crimson flame produced by its salts. It also has many high technology applications because of its high refractive index as a titanate in glass, as a "getter" in electron tubes and as a dopant for numerous perovskite formulations to produce cathodes for oxygen generation or solid oxide fuel cells. Historically the primary use of strontium has been to produce CRT glass for color televisions and computer monitors. High Purity (99.999%) Strontium (Sr) Sputtering TargetStrontium is available as metal and compounds with purities from 99% to 99.999% (ACS grade to ultra-high purity). Elemental or metallic forms include pellets, rod, wire and granules for evaporation source material purposes. High Purity (99.999%) Strontium Oxide (SrO)PowderStrontium nanoparticles and nanopowders provide ultra-high surface area which nanotechnology research and recent experiments demonstrate function to create new and unique properties and benefits. Oxides are available in powder and dense pellet form for such uses as optical coating and thin film applications. Oxides tend to be insoluble. Fluorides are another insoluble form for uses in which oxygen is undesirable such as metallurgy, chemical and physical vapor deposition and in some optical coatings. Strontium is also available in soluble forms including chlorides, nitrates and acetates. These compounds can be manufactured as solutions at specified stoichiometries.

The non-radioactive isotopes of Strontium are not toxic. Safety data for Strontium and its compounds can vary widely depending on the form. For potential hazard information, toxicity, and road, sea and air transportation limitations, such as DOT Hazard Class, DOT Number, EU Number, NFPA Health rating and RTECS Class, please see the specific material or compound referenced in the Products tab below.

  • Properties
  • Safety Data
  • Products
  • Research
  • Isotopes
  • Other Elements

Strontium Properties

Symbol: Sr Melting Point: 777 oC, 1430.6 oF, 1050.15 K
Atomic Number: 38 Boiling Point: 1377 oC, 2510.6 oF, 1650.15 K
Atomic Weight: 87.62 Density: 2.54 gm/cc
Element Category: alkaline earth metal Liquid Density @ Melting Point: 2.375 g·cm−3
Group, Period, Block: 2, 5, s Specific Heat: 0.0719Cal/g/K @ 25°C
    Heat of Vaporization 154.4 kJ mol-1
CHEMICAL STRUCTURE Heat of Fusion 9.16 kJ mol-1
Electrons: 38 Thermal Conductivity: 0.354W/cm/K @ 298.2 K
Protons: 38 Thermal Expansion: (25 °C) 22.5 µm·m−1·K−1
Neutrons: 50 Electrical Resistivity: 23.0 microhm-cm @ 20
Electron Configuration: [Kr]5s2 Electronegativity: 1.0 Paulings
Atomic Radius: 215 pm Tensile Strength: N/A
Covalent Radius: 195±10 pm Molar Heat Capacity: 26.4 J·mol−1·K−1
Van der Waals radius: 249 pm Young's Modulus: 15.7 GPa
Oxidation States: 2, 1 (strongly basic oxide) Shear Modulus: 6.03 GPa
Phase: Solid Bulk Modulus: N/A
Crystal Structure: face-centered cubic Poisson Ratio: 0.28
Magnetic Ordering: paramagnetic Mohs Hardness: 1.5
1st Ionization Energy: 549.48 kJ mol-1 Vickers Hardness: N/A
2nd Ionization Energy: 1064.25 kJ mol-1 Brinell Hardness: N/A
3rd Ionization Energy: 4138.29 kJ mol-1 Speed of Sound: N/A
CAS Number: 7440-24-6 Abundance in typical human body, by weight: 4600 ppb
ChemSpider ID: 4514263 Abundance in typical human body, by atom: 330 ppb
PubChem CID: 5359327 Abundance in universe, by weight: 40 ppb
MDL Number: MFCD00134060 Abundance in universe, by atom: 0.06 ppb
EC Number: 231-133-4 Discovered By: William Cruickshank
Beilstein Number: N/A Discovery Date: 1787
SMILES Identifier: [SrH2]  
InChI Identifier: InChI=1S/Sr Other Names: Stronzio, Estrôncio

Strontium Products

Metal Forms  •  Compounds  •  Alloys  •  Oxide Forms  •  Organometallic Compounds
Sputtering Targets  •  Nanomaterials  •  Semiconductor Materials •  Isotopes


Lanthanum Nickelate, Strontium Doped
Lanthanum Strontium Chromite (LSC)
Lanthanum Strontium Cobalt Chromite Paste
Lanthanum Strontium Cobalt Ferrite (LSCF)
Lanthanum Strontium Cobalt Ferrite Paste
Lanthanum Strontium Ferrite (LSF)
Lanthanum Strontium Gallate Magnesium (LSGM)
Lanthanum Strontium Manganite (LSM)
Lanthanum Strontium Manganite Paste
Lanthanum Strontium Manganite/Zirconia Paste
Strontium Acetate
Strontium Acetate Hydrate
Strontium Acetate Solution
Strontium Aluminate
Strontium Aluminide
Strontium Arsenate
Strontium Boride
Strontium Bromate
Strontium Bromide
Strontium Bromide, Ultra Dry
Strontium Bromide Hexahydrate
Strontium Carbide
Strontium Carbonate
Strontium Chloride
Strontium Chloride, Ultra Dry
Strontium Chloride Hexahydrate
Strontium Chloride Solution
Strontium Chromate
Strontium Ferrite
Strontium Fluoride
Strontium Hydride
Strontium Hydroxide
Strontium Hydroxide Octahydrate
Strontium Iodate
Strontium Iodide
Strontium Lanthanum Aluminate
Strontium Lanthanum Sulfide
Strontium Molybdate
Strontium Niobate
Strontium Nitrate
Strontium Nitrate Solution
Strontium Nitride
Strontium Oxide
Strontium Perchlorate Hydrate
Strontium Peroxide
Strontium Phosphate
Strontium Pyrophosphate
Strontium Selenate
Strontium Silicide
Strontium Stannate
Strontium Sulfate
Strontium Sulfate Solution
Strontium Zirconate
Strontium Tin Oxide

Organometallic Compounds



Cerium(IV) 2-Methoxyethoxide
Strontium 2-Ethylhexanoate
Strontium Acetylacetonate
Strontium Isopropoxide
Strontium Oxalate
Strontium Ranelate
Strontium Tetramethylheptanedionate
Strontium Trifluoromethanesulfonate
Crystal/ Semiconductor Materials

Barium Strontium Titanate
Strontium Aluminate, Eu and Dy Doped Long Persistent Green Phosphor
Strontium Aluminate, Eu and Dy Doped Long Persistent Blue-Green Phosphor
Strontium Titanate Single Crystal Substrate
Strontium Arsenide
Strontium Barium Niobate
Strontium Phosphide
Strontium Selenide
Strontium Silicate Aluminate, Europium and Dysprosium Doped
Strontium Sulfide
Strontium Telluride
Strontium Titanate
Strontium Titanate (Bismuth Doped)
Strontium Titanate (Iron Doped)
Strontium Titanate (Niobium Doped)


Barium Strontium Titanate Nanopowder
Lanthanum Strontium Manganite Nanopowder
Samarium Strontium Cobalt Oxide Nanopowder
Strontium Aluminum Oxide Nanopowder
Strontium Carbonate Nanoparticles
Strontium Ferrite Nanopowder
Strontium Iron Oxide Nanopowder
Strontium Nanoprisms
Strontium Oxide Nanopowder
Strontium Titanate Nanoparticles
Strontium Titanate Nanopowder

Sputtering Targets

Barium Strontium Titanate Sputtering Target
Lanthanum Strontium Chromite Sputtering Target
Lanthanum Strontium Manganite Sputtering Target
Strontium Fluoride Sputtering Target
Strontium Oxide Rotatable Sputtering Target
Strontium Oxide Sputtering Target
Strontium Phosphide Sputtering Target
Strontium Rotatable Sputtering Target
Strontium Ruthenate Sputtering Target
Strontium Selenide Sputtering Target
Strontium Sputtering Target
Strontium Telluride Sputtering Target
Strontium Titanate Sputtering Target

Oxide Forms

Barium Strontium Niobium Oxide
Barium Strontium Titanium Oxide
Samarium Strontium Cobalt Oxide
Strontium Lanthanum Aluminum Oxide
Strontium Lanthanum Gallium Oxide
Strondium Oxide Pellets
Strondium Oxide Pieces
Strondium Oxide Powder
Strontium Oxide Shot
Strontium Oxide Tablets


Aluminum Strontium Alloy

Recent Research & Development for Strontium

  • Application of TREECS Modeling System to Strontium-90 for Borschi Watershed near Chernobyl, Ukraine. Johnson BE, Dortch MS. J Environ Radioact. 2014.
  • The inhibitory effect of strontium-doped calcium polyphosphate particles on cytokines from macrophages and osteoblasts leading to aseptic loosening in vitro. Huang C, Li L, Yu X, Gu Z, Zhang X. Biomed Mater. 2014.
  • Monitoring bone strontium intake in osteoporotic females self-supplementing with strontium citrate with a novel in-vivo X-ray fluorescence based diagnostic tool. Moise H, Chettle DR, Pejovic-Milic A. Bone. 2014.
  • Controlling initial biodegradation of magnesium by a biocompatible strontium phosphate conversion coating. Chen XB, Nisbet DR, Li RW, Smith PN, Abbott TB, Easton MA, Zhang DH, Birbilis N. Acta Biomater. 2014 Mar.
  • Hydrothermal synthesis and characterization of Si and Sr co-substituted hydroxyapatite nanowires using strontium containing calcium silicate as precursors. Zhang N, Zhai D, Chen L, Zou Z, Lin K, Chang J. Mater Sci Eng C Mater Biol Appl. 2014
  • Osteoblastic cell response on biphasic fluorhydroxyapatite/strontium-substituted hydroxyapatite coatings. Yin P, Feng FF, Lei T, Zhong XH, Jian XC. J Biomed Mater Res A. 2014 Mar.
  • Intervention timing of strontium treatment on estrogen depletion-induced osteoporosis in rats: Bone microstructure and mechanics. Peng S, Liu XS, Huang S, Pan H, Zhen W, Zhou G, Luk KD, Guo XE, Lu WW. J Orthop Res. 2014 Mar.
  • Geographic determination of coffee beans using multi-element analysis and isotope ratios of boron and strontium. Food Chem. 2014 2013/09/05 | first author:Liu HC
  • Precise determination of strontium isotope ratios by TIMS to authenticate tomato geographical origin. Trincherini PR, Baffi C, Barbero P, Pizzoglio E, Spalla S. Food Chem. 2014 Feb.
  • Preclinical evaluation of strontium-containing bioactive bone cement. Mater Sci Eng C Mater Biol Appl. 2013 2013/10/08 | first author:Li Z
  • Application of ICP-DRC-MS to screening test of strontium and plutonium in environmental samples at Fukushima. Appl Radiat Isot. 2013 2013/05/16 | first author:Sakama M
  • Spatial distribution of the trace elements zinc, strontium and lead in human bone tissue. Bone. 2013 | first author:Pemmer B
  • Baseline concentrations of strontium and (90)Sr in seawater from the northern Gulf. Mar Pollut Bull. 2013 | first author:Uddin S
  • Bone formation induced by strontium modified calcium phosphate cement in critical-size metaphyseal fracture defects in ovariectomized rats. Biomaterials. 2013 2013/08/03 | first author:Thormann U
  • Isolation of strontium pools and isotope ratios in modern human hair. Anal Chim Acta. 2013 2013/09/28 | first author:Tipple BJ
  • Strontium Localization in Bone Tissue Studied by X-Ray Absorption Spectroscopy. Calcif Tissue Int. 2013 2013/10/09 | first author:Frankar CG
  • Enhanced osteoporotic bone regeneration by strontium-substituted calcium silicate bioactive ceramics. Biomaterials. 2013 2013/10/08 | first author:Lin K
  • Pure Hydroxyapatite Phantoms for the Calibration of in Vivo X-ray Fluorescence Systems of Bone Lead and Strontium Quantification. Anal Chem. 2013 2013/08/29 | first author:Da Silva E.
  • Pulsed electrodeposition for the synthesis of strontium-substituted calcium phosphate coatings with improved dissolution properties. Mater Sci Eng C Mater Biol Appl. 2013 2013/08/06 | first author:Drevet R.
  • Processing and properties of textured potassium strontium niobate (KSr(2)Nb(5)O(15)) ceramic fibers-effect of texture on the electrical properties. IEEE Trans Ultrason Ferroelectr Freq Control. 2013 | first author:Alkoy S
  • SBN60, strontium-barium niobate at 100 K. Acta Crystallogr Sect E Struct Rep Online. 2013 | first author:Stachowicz MHuo L, Qian T, Hao J, Liu H, Zhao D. Effect of water content on strontium retardation factor and distribution coefficient in Chinese loess. J Radiol Prot. 2013.

Strontium Isotopes

Strontium has four stable isotopes: 84Sr (0.56%), 86Sr (9.86%), 87Sr (7.0%) and 88Sr (82.58%).

Nuclide Symbol Isotopic Mass Half-Life Nuclear Spin
84Sr 83.913425 Observationally Stable 0+
86Sr 85.9092607309 Stable 0+
87Sr 86.9088774970 Stable 9/2+
88Sr 87.9056122571 Stable 0+