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Date: 5-3-2017
1591
Date: 31-1-2018
1159
Date: 4-11-2018
1348
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Polymeric hydrides
Polymeric hydrides (white solids) are formed by Be and Al. In BeH2 (Figure 1.1), each Be centre is tetrahedral, giving a chain structure in which multi-centre bonding of the type described for B2H6 is present. The structure of AlH3 consists
of an infinite lattice, in which each Al(III) centre is in an AlH6-octahedral site; H atoms bridge pairs of Al centres.
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دراسة تحدد أفضل 4 وجبات صحية.. وأخطرها
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العتبة العباسية تستعدّ لتكريم عددٍ من الطالبات المرتديات للعباءة الزينبية في جامعات كركوك
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