L—T 5种短周期元素的信息如下表,有关叙述正确的是(   ) 元素代

L—T 5种短周期元素的信息如下表有关叙述正确的是(   )

元素代号

L

M

Q

R

T

原子半径/nm

0.160

0.143

0.112

0.104.Z.X.X.K]

0.066

主要化合价

+2

+3

+2

+6+4-2

-2

A.与稀盐酸反应的剧烈程度:L单质<Q单质  

B.热稳定性:H2TH2R 

CMT形成的化合物具有两性       

DL2R2的核外电子数相等

答案

【答案】C    

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