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【简答题】
过渡金属配合物常满足 “18 电子规则 ”, 即中心原子的价电子数与配体提供的电子数之和等于 18, 如 [Fe(CO) 5 ] 、 [Mn(CO) 5 ] - 等都满足这个规则。 (1) 下列钒配合物中 , 钒原子满足 “18 电子规则 ” 的是 __________( 依次填标号 ) 。 A.[V(H 2 O) 6 ] 2+ B.[V(CN) 6 ] 4- C.[V(CO) 6 ] - D.[V(O 2 ) 4 ] 3- 【资料】多齿配体能够提供多对孤对电子,与中心原子形成多个配位键,例如EDTA是一种常用的六齿配体,1个EDTA分子能提供6对孤对电子,与中心原子形成配位数为6的配合物。 二是一种典型的多齿配体配位形成的配合物,配体的分子式为: C 5 H 5 — 。 二分子结构为: 。 (2) 中心原子的化合价为 ____________价 。 (3) 某些电子云密集的大π键也是一种提供电子的优良配体。二的每个配体中的 键能够提供 6 个电子给中心原子形成配位键,则该物质 的中心离子 配位数是 _____ 。 (4) 该结构中的 Fe 是否满足“ 18 电子规则”? _________ (填“是”或“否”)
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【单选题】According to the professor, which is the most famous pollinator?
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The honeybees.
B.
The long-nosed bats.
C.
The monarch butterflies.
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cure allergies
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A.
Queen bees and worker bees are both female.
B.
Worker bees are smaller than queen bees.
C.
Queen bees develop by being fed royal jelly.
D.
Worker bees produce eggs to maintain the hive population.
E.
Queen bees and worker bees are genetically identical.
查看完整题目与答案