题目

As the new semester begins, millions of college students across the country are trying hard to remember how best to write a paper or, more likely, how best to delay that paper.  Procrastination is the thief of time and a lot of students suffer form it. They can spend whole days in the library doing nothing but staring into space, eating snacks, surfing the Internet, watching videos and looking at other students sitting around them, who, most likely are doing nothing either.  Paralyzed (使失去活力) by their habit to procrastinate, they write micro blogs about their fears, asking 铁氮化合物(FexNy)在磁记录材料领域有着广泛的应用前景。某FexNy的制备需铁、氮气、丙酮和乙醇参与。（1）Fe2+的价电子排布式为_______。（2）氮气、氨气、肼（N2H4）中氮原子孤电子对数之比为_______，氨分子的空间构型是______（3）丙酮()分子中碳原子轨道的杂化类型是_____，1 mol 丙酮分子中含有σ键的数目为______。（4）C、N、O三种元素的电负性由小到大的顺序为______。（5）乙醇的沸点高于丙酮，这是因为_____。（6）CN-与N2是等电子体，CN-的电子式为______。（7）某FexNy的晶胞如图1所示，Cu可以完全替代该晶体中a位置Fe或者b位置Fe，形成Cu替代型产物Fe(xn)CunNy。FexNy转化为两种Cu替代型产物的能量变化如图2所示，其中更稳定的Cu替代型产物的化学式为___，若晶胞参数为a pm，则该晶胞的密度为____g/cm3。