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Date: 31-1-2018
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Date: 20-12-2018
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Date: 2-1-2018
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Krypton
Krypton is one of the six Noble Gas elements (Group 18), which are widely known for their relative "inertness" and difficulty in forming chemical compounds with any other elements, due to these elements having full valence shells. Contrary to original thinking, however, Krypton has been made to react with the highly electronegative elements and is used in lighting and other commercial purposes.
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نصائح للحد من خطر قصر النظر عند الأطفال
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اكتشاف آثار حياة مجهولة في الصخور الصحراوية في عمان والسعودية وناميبيا
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هكذا استقبلت العتبة الكاظمية المقدسة ليلة هي خيرٌ من ألف شهر .. الليلة الأولى من ليالي القدر المباركة
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