题目内容

将下列符号中“2”所表示的意义填写在横线上

(1)H2O                                                                                         

(2)2Cu                                                                                          

(3)                                                                                      

(4)2SO2                                                                                        

(5)H2                                                                                            

(6)                                                                                     

(1)一个水分子中含有2个氢原子           (2)2个铜原子

(3)2个氯离子                                       (4)2个二氧化硫分子

(5)一个氢分子由2个氢原子构成           (6)在氧化镁中镁元素的化合价为+2价

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