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Sr ( Strontium )


     Strontium will burn in air and reacts with water more vigorously than calcium. It is usually kept under paraffin to prevent oxidation.    A. Crawford first recognized strontium as an element in 1790, but it wasn't isolated until 1808 by Sir Humphry Davy in London England.

Nama lain (trademark, branding etc.)

Strontium, Stroncium, Stroncij, Strontium - s, Estrôncio, Стронций, 

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Overview of Strontium
Atomic Number 38
Group 2
Period 5
Series Alkali Earth Metals
Relative Atomic Mass (12C=12.000)  87.62
Boiling Point:  1657K 1384°C 2523°F
Melting Point:  1042K 769°C 1416°F
Density/kg m-3  2540 (293K)
Ground State Electron Configuration  [Kr]5s2
Electron Affinity(M-M-)/kJ mol-1  146
Discovery Year:  1790
Name Origin: From Strontian a small Scottish town.


     Strontium is mainly used for producing glass for colour television sets. It is also used in producing ferrite magnets and refining zinc. One of the radioactive isotopes of strontium, 90Sr, is a product of nuclear fallout and presents a health problem. It has a half-life of 28 years. It is absorbed by bone tissue instead of calcium and can destroy bone marrow and cause cancer. However, it is also a useful isotope as it is one of the best high-energy beta-emitters known.

Bahan Baku

Strontium (/ˈstrɒntiəm/ stron-tee-əm) is a chemical element with symbol Sr and atomic number 38. An alkaline earth metal, strontium is a soft silver-white or yellowish metallic element that is highly reactive chemically. The metal turns yellow when it is exposed to air. Strontium has physical and chemical properties similar to those of its two neighbors calcium and barium. It occurs naturally in the minerals celestine and strontianite. While natural strontium is stable, the synthetic 90Sr isotope is present in radioactive fallout and has a half-life of 28.90 years.

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    Strontium is a soft, silver-yellow, alkaline-earth metal. It has three allotropic crystalline forms and in its physical and chemical properties it is similar to calcium and barium. Strontium reacts vigorously with water and quickly tarnishes in air, so it must be stored out of contact with air and water. Due to its extreme reactivity to air, this element always naturally occurs combined with other elements and compounds. Finely powdered strontium metal will ignite spontaneously in air to produce both strontium oxide and strontium nitride.
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