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（本题共14分）X、Y、Z、W为短周期的主族元素，其原子序数依次增大。X元素形成的单质是自然界中含量最多的气体。Y是电负性最大的元素。W的原子最外层电子数与核外电子总数之比为3∶8。X的原子序数是Z的原子序数的一半。U原子基态的外围电子排3d 10 4s 1 。 （1）Z基态的核外电子排布式 ，U在周期表中位置为 。 （2）在Y的氧化物OY 2 中，氧原子的杂化轨道类型是 。 （3）在银氨溶液中通入W的气态氢化物，会出现黑色沉淀，该反应的离子方程式是 。 （4）1molX的气态氢化物在800～900℃下催化氧化放出226.25KJ热量。该反应的热化学方程式为 _ 。 （5）U的含氧化合物M晶胞如右图所示（“○”表示氧原子），则M的化学式为 ；氧原子的配位数为 。
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