a、b、c、d是四种短周期元素。a、b、d同周期,c、d同主族。a的原子

 abcd是四种短周期元素。abd同周期,cd同主族。a的原子结构

 


示意图为 ,           bc形成化合物的电子式为   下列比较中正确的是

A.原子半径:acdb                  B.电负性abdc

C.原子序数:dacb               D.最高价含氧酸的酸性cda

答案

D

相关题目

 You’d better have the second-hand car ______ before you sell it. A. repaire
 You’d better have the second-hand car ______ before you sell it. A. repaired                            B. repair                C. in repair     
     The volunteers are doing _____ difficult and important work; they shar
     The volunteers are doing _____ difficult and important work; they share ____ common goal to help people in need.       A. a; a                       B. a; the  
对于地球的自转与公转描述正确的是                
对于地球的自转与公转描述正确的是                                   (     ) A.方向相同 B.周期相同  C.自转产生的现象
- Helo,this is Wendy. Can I speak to Jessica?- Yes,_____.A.Jessica is me
- Helo,this is Wendy. Can I speak to Jessica?- Yes,_____.A.Jessica is meB.Jessica,pleaseC.my name is JessicaD.this is Jessica speaking
函数的自变量x的取值范围是__________________.
函数的自变量x的取值范围是__________________.
 ---How about        party?  ---Cool! It was really      great fu
 ---How about        party?  ---Cool! It was really      great fun! Pity you weren’t there. A the; /                B the; a              C  a; the   
某同学用如图所示装置制取纯净的氧气。试回答下列问题:
某同学用如图所示装置制取纯净的氧气。试回答下列问题:                   (1)乙中Na2O2可能发生的反应有                     
如图,下列图案可以通过图案①平移得到(      )
如图,下列图案可以通过图案①平移得到(      )

最新题目