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氯化铬酰（CrO 2 Cl 2 ）在有机合成中可作氧化剂或氯化剂，能与许多有机物反应。请回答下列问题： ⑴写出基态铬原子的外围轨道表示式_______________________________，与铬同周期的所有元素的基态原子中最外层电子数与铬原子相同的元素有____________（填元素符号），其中一种金属的晶胞结构如右图所示，该晶胞中含有金属原子的数目为________。 ⑵CrO 2 Cl 2 常温下为深红色液体，能与CCl 4 、CS 2 等互溶，据此可判断CrO 2 Cl 2 是__________（填“极性”或“非极性”）分子。 ⑶在①苯、②C 2 H 4 、③CCl 4 、④CO 2 五种有机溶剂中，碳原子采取sp 2 杂化的分子有___________（填序号），CO 2 分子的空间构型是______________。
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