Strontium

Strontium
strontium
Symbol Sr
Atomic Number 38
Atomic Mass 87.62 g.mol -1
Discovered by Adair Crawford in 1790

Chemical Properties of Strontium

Group 2 Melting point 777°C, 1431°F, 1050 K
Period 5 Boiling point 1377°C, 2511°F, 1650 K
Block s Density (g cm−3) 2.64 
Atomic number 38 Relative atomic mass 87.62
State at 20°C Solid Key isotopes 86Sr, 87Sr, 88Sr
Electron configuration [Kr] 5s2 CAS number 7440-24-6
ChemSpider ID  4514263 ChemSpider is a free chemical structure database.

What is Strontium?

  • Strontium belongs to the group 2 elements of the periodic table, along with Be, Mg, Ca and Ba.

Uses of Strontium

  • Although strontium is not considered as an essential element and does not have any known biological role, it is present in all living organisms.
  • Strontium resembles the calcium element in its properties; like calcium, it is taken up and preferentially located in bones.
  • Here, strontium can have both beneficial and deleterious effects in humans depending on the amount taken up [854].
  • Strontium ranelate (C12H6N2O8SSr2 ), a pharmacologic agent used to treat individuals with osteoporosis, is indicated to be used in Europe and Australia but not in Canada or in the United States. Similar efficiency to delivery strontium to bones of animals was found for strontium citrate [855].
  • Injectable acrylic bone cement are widely used in orthopedic surgery to fix artificial prostheses. Conventional polymethylmethacrylate (PMMA) bone cement has been successfully used in arthroplasties of hip, knee and other joints for the fixation of polymer or metallic prosthetic implants to living bone; however, it still has some potential problems and risks, such as poor adhesion of bone cement to bone surface and high exothermic reaction during the polymerization

Properties of Strontium

  • It has an atomic number of 38, an atomic mass of 88, one oxidation state (+2) and four naturally occurring isotopes (84Sr, 86Sr, 87Sr, 88Sr), of which 88Sr is the most abundant at 82.6% of the total mass.
  • Strontium is most similar chemically to the heavier alkali earth elements, Calcium, and Barium.
  • Strontium is a lithophile metallic element.
  • The size of the Sr2+ ion (118 pm) is intermediate between those of Ca2+ (100 pm) and K+ (138 pm), for which it may substitute in a variety of rock-forming minerals including K-feldspar, gypsum, plagioclase and, especially, calcite and dolomite, which are the main sources of Sr in stream water.
  • Some substitution for Ba also takes place in barite BaSO4 and witherite BaCO3.
  • Minerals of Sr are relatively rare but include strontianite SrCO3 and celestite SrSO4, which are mainly associated with hydrothermal deposits or pegmatites.
  • Strontium is strongly associated with calcium and is indicative of calcareous rocks, especially in association with Sr, Mg, and Ba. Where Ca and other elements indicate calcareous rocks and other elements (e.g., REEs) indicate felsic intrusives, bedrock geology may be favorable for skarn mineralization.

Practise This Question

Crystals of copper sulphate are prepared by the method of: