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Date: 28-2-2017
476
Date: 28-11-2016
472
Date: 20-6-2019
741
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Coordination number 9
The anions [ReH9]2- and [TcH9]2- (both d0) provide examples of 9-coordinate species in which the metal centre is in a tricapped trigonal prismatic environment . A coordination number of 9 is most often associated with yttrium, lanthanum and the f-block elements. The tricapped trigonal prism is the only regular arrangement of donor atoms yet observed, e.g. in [Sc)H2O(9]+ , [Y(H2O)9]3+ and [La(H2O)9]3+.
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علامات بسيطة في جسدك قد تنذر بمرض "قاتل"
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أول صور ثلاثية الأبعاد للغدة الزعترية البشرية
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وفد كلية الزراعة في جامعة كربلاء يشيد بمشروع الحزام الأخضر
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