萤石(CaF2)晶体属于立方晶系,萤石中每个Ca2+被8个F-所包围,则每个F

萤石(CaF2)晶体属于立方晶系,萤石中每个Ca2+被8个F-所包围,则每个F周围最近距离的Ca2+数目为                                                    (       )

A.2          B.4            C.6            D.8

答案

B

相关题目

如图2所示,A1A2两块面积很大,互相平行又相距较近的带电金
如图2所示,A1A2两块面积很大,互相平行又相距较近的带电金属板,相距为d,两板间的电势差为U.同时,在这两板间还有垂直纸面向外的匀强磁场.一束
某生物学习小组利用甲、乙、丙三种动物探究动物的绕道取
某生物学习小组利用甲、乙、丙三种动物探究动物的绕道取食行为.动物甲、乙、丙完成绕道取食前的尝试次数分别是165次、32次、5次.分析数据可知
÷;
÷;
The following are a few cities with cheap attractions or restaurants in Califor
The following are a few cities with cheap attractions or restaurants in California, the US. Cathedral City The Indian Oven in the city will give you a high-quality dining experience. It’s a resta
已知A、B、C、D都是含有碳、氢、氧三种元素的有机物,其中A
已知A、B、C、D都是含有碳、氢、氧三种元素的有机物,其中A、C分别是白酒和食醋中含有的成分,A、B、C、D间有如下转化关系: 请回答下列问题: (1
今有一组实验数据如右表,现准备用下列函数中的一个近似
今有一组实验数据如右表,现准备用下列函数中的一个近似地表示这些数据满足的规律,其中最接近的一个是(   ) 1.993.04.05.16.12 1.54.047.51218.01 A.  
 有理数、在数轴上的对应点如图所示: (1)用“<”、
 有理数、在数轴上的对应点如图所示: (1)用“<”、 “>”或“=”填空: ①y    0;    ②x+y    0;               ③    .        
One year ago. I asked a worker to help me repair my old house. He had a bad firs
One year ago. I asked a worker to help me repair my old house. He had a bad first day on the job: his car broke on the way, then he found he had left his tools for work at home and his wife telephoned

最新题目