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Date: 9-1-2018
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Date: 14-4-2016
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Date: 26-11-2018
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The reactivities of the halogens decrease down the group ( At < I < Br < Cl < F). This is due to the fact that atomic radius increases in size with an increase of electronic energy levels. This lessens the attraction for valence electrons of other atoms, decreasing reactivity. This decrease also occurs because electronegativity decreases down a group; therefore, there is less electron "pulling." In addition, there is a decrease in oxidizing ability down the group.
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لخفض ضغط الدم.. دراسة تحدد "تمارين مهمة"
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طال انتظارها.. ميزة جديدة من "واتساب" تعزز الخصوصية
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مشاتل الكفيل تزيّن مجمّع أبي الفضل العبّاس (عليه السلام) بالورد استعدادًا لحفل التخرج المركزي
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