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Date: 19-1-2018
1045
Date: 10-3-2019
913
Date: 26-12-2018
847
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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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"عادة ليلية" قد تكون المفتاح للوقاية من الخرف
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ممتص الصدمات: طريقة عمله وأهميته وأبرز علامات تلفه
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المجمع العلمي للقرآن الكريم يقيم جلسة حوارية لطلبة جامعة الكوفة
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