X、Y为短周期元素,X位于IA族,X与Y可形成化合物X2Y,下列说法正确

XY为短周期元素,X位于IA族,XY可形成化合物X2Y,下列说法正确的是

A.X的原子半径一定大于Y的原子半径

B.XY的简单离子不可能具有相同的电子层结构

C.两元素形成的化合物中,原子个数比不可能为11

D.X2Y可能是离子化合物,也可能是共价化合物

答案

【答案】D

【解析】本题考查周期表的知识。由题分析X为ⅠAY为ⅥAX2Y可以是H2ONa2ONa2S等化合物,故AB错误。NaO可形成Na2O2HO可形成H2O2化合物,C错误,D正确。可能是离子化合物Na2ONa2S,也可以是共价化合物H2O

相关题目

Some cameras have been installed to        those vehicles that always bre
Some cameras have been installed to        those vehicles that always break speed limits at night. A.watch over           B.look into        C.protect from       
在图所示的电路中,电源电压为6伏,滑动变阻器标有“10W  1
在图所示的电路中,电源电压为6伏,滑动变阻器标有“10W  1A”字样。闭合电键S,电流表的示数为0.5安,电压表的示数为2伏。求:(1)此时滑动变阻
-Would you please help me with my writing skills?   -__________. You can come
-Would you please help me with my writing skills?   -__________. You can come to my office every Saturday.    A. That's all right                B. Not at all    C. No problem
 ---I hear Ted got hurt badly in the car accident yesterday.  ---It’s true.
 ---I hear Ted got hurt badly in the car accident yesterday.  ---It’s true. His careless driving was the       of the accident.       A. reason               B. cause  
“世上疮痍,诗中圣哲;民间疾苦,笔底波澜。”郭沫若写
“世上疮痍,诗中圣哲;民间疾苦,笔底波澜。”郭沫若写的这副对联是在称颂 A.屈原       B.杜甫                  C.杜牧         D.
完型填空。Young people are often unhappy when they are with their parents.
完型填空。Young people are often unhappy when they are with their parents. They say that their parents don’t  1  them. They often think their parents are too strict with them, and they are ne
“月亮既不会掉下来,也不会离去,那是因为它的运动正好
“月亮既不会掉下来,也不会离去,那是因为它的运动正好抵消了地球的引力。”说这句话的科学家是(   ) A.牛顿  B.波义耳    C.拉瓦锡   D.哥白
下图为我国某区域简图,回答1~2题。 1.导致甲、乙两地气
下图为我国某区域简图,回答1~2题。 1.导致甲、乙两地气温低于同纬度其他地区的主要原因是( ) A.黄河流经         B.地形起伏      C.矿产

最新题目