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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.
    • Rotterdamseweg 402 M HH Delft


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    Manganese is a chemical element, designated by the symbol Mn. It has the atomic number 25. It is found as a free element in nature (often in combination with iron), and in many minerals. Manganese is a metal with important industrial metal alloy uses, particularly in stainless steels.
    • Jl. Borong Raya Prima Griya Panakkukang Blok B 7 Kota Makassar


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    Zirkon adalah suatu unsur kimia dengan simbol Zr, nomor atom 40 dan massa atom 91,224.
    • Jl. Borong Raya Prima Griya Panakkukang Blok B 7 Kota Makassar


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    • Suite 200, 6125 - 11th Street SE Calgary