strontium

** Element's name: __Strontium__  **
 * Strontium's atomic number: 38
 * Stontium's symbol: Sr
 * Mass Number: 88
 * Group number: 2
 * Period: 5
 * color:yellowish
 * Number of neutrons:50
 * Number of [[image:protons.gif width="220" height="208" align="right"]]protons/electrons:38
 * Strontium is like the solid calcium ( even the body confuses the two.)
 * Standard state: solid at 298 k
 * Classified as an Alkaline earth metal. (dangerous)
 * Origin of name: Named after the village of "strontian" in Scotland.
 * Founder/ year founded: Adair Crawford in 1790.
 * <span style="FONT-FAMILY: 'Palatino Linotype', 'Book Antiqua', Palatino, serif">Obtained from: celestite, and strontianite
 * <span style="FONT-FAMILY: 'Palatino Linotype', 'Book Antiqua', Palatino, serif">Use of Strontium:
 * <span style="FONT-FAMILY: 'Palatino Linotype', 'Book Antiqua', Palatino, serif"> Fireworks and flares(It is the red flame)
 * <span style="FONT-FAMILY: 'Palatino Linotype', 'Book Antiqua', Palatino, serif"> Produces glass for colour tv tubes
 * <span style="FONT-FAMILY: 'Palatino Linotype', 'Book Antiqua', Palatino, serif"> Optical material
 * <span style="FONT-FAMILY: 'Palatino Linotype', 'Book Antiqua', Palatino, serif"> Refining material
 * <span style="FONT-FAMILY: 'Palatino Linotype', 'Book Antiqua', Palatino, serif"> 90Sr can be used as a lightweight nuclear producing electricity

**How and who:** Adair Crawford in 1790. He was studying certain minerals that were on display at St. Thomas's. He found that some of the minerals did not behave as he expected. They did not have the properties of barium minerals. He concluded that the minerals contained a new element. He called the element strontia. He named it after a **lead** mine in Strontia, Scotland, from which the samples came. Strontium is so active it has to be stored under kerosene or mineral oil, so the metal does not come into contact with air. In a finely divided or powdered form, strontium catches fire spontaneously and bums vigorously. Strontium is active enough to combine even with **hydrogen** and **nitrogen** when heated. The compounds formed are strontium hydride (SrH2) and strontium nitride (Sr3N2). Strontium also reacts with cold water and with acids to release hydrogen gas:
 * <span style="COLOR: #8395ec; FONT-FAMILY: 'Comic Sans MS', cursive"> **Strontium has no biological role, no importance. It is in your body though! Our bodies confuse it with calcium and it makes its way to the skelton and stays there in place of calcium**. It is dangerous when combined with air and other minerals.
 * **Physical properties:**
 * <span style="FONT-FAMILY: Georgia, serif"> melting point: 1050 [or 777 °C (1431 °F)] K
 * <span style="FONT-FAMILY: Georgia, serif"> Boiling Point:1655 [or 1382 °C (2520 °F)] K
 * <span style="FONT-FAMILY: Georgia, serif"> Mineral Hardness: 1.5
 * <span style="FONT-FAMILY: Georgia, serif"> Density of solid 2630 kg m-3
 * <span style="FONT-FAMILY: Georgia, serif"> crystal structure is cubic
 * __Chemical properties__** **__:__**
 * Ions: Strontium is in the group 2a and has an ionic charge of 2+. (Sr2+)
 * Compounds:  <span style="FONT-FAMILY: 'Trebuchet MS', Helvetica, sans-serif">:
 * Strontium difluoride:
 * SrF2 Strontium dichloride: SrC12
 * <span style="FONT-FAMILY: 'Trebuchet MS', Helvetica, sans-serif"> <span style="FONT-FAMILY: 'Trebuchet MS', Helvetica, sans-serif">  Strontium diiodide:SrI2
 * <span style="FONT-FAMILY: 'Trebuchet MS', Helvetica, sans-serif"> Strontium oxide: SrO
 * <span style="FONT-FAMILY: 'Trebuchet MS', Helvetica, sans-serif"> Strontium peroxide: SrO2
 * <span style="FONT-FAMILY: 'Trebuchet MS', Helvetica, sans-serif"> Strontium sulphide: SrS
 * <span style="FONT-FAMILY: 'Trebuchet MS', Helvetica, sans-serif"> Strontium selenide: SrSe

<span style="COLOR: #b54cf0; FONT-FAMILY: 'Palatino Linotype', 'Book Antiqua', Palatino, serif">Isotops:
<span style="COLOR: #b54cf0; FONT-FAMILY: 'Palatino Linotype', 'Book Antiqua', Palatino, serif">Stronium has four stable isotops that occure in nature, two of which are medical applications. Resources:
 * <span style="COLOR: #b54cf0; FONT-FAMILY: 'Palatino Linotype', 'Book Antiqua', Palatino, serif">81Sr 80Sr 82Sr 83Sr 85Sr 89Sr 90Sr 91Sr 92Sr
 * 1) Bentor, Yinon__. Chemical-Elements-Strontium__. Oct.21,2008 http://www.chemicalelements.com/elements/sr.html
 * 2) [|www.webelements.com]
 * 3) http://environmentalchemistry.com/yogi/periodic/Sr.html
 * 4) http://www.chemistryexplained.com/elements/P-T/Strontium.html