说出下列数字2的含义: (1)2O:_____________________
问题:
说出下列数字2的含义:
(1)2O:_____________________
(2)P2O5:____________________
(3)2O3:______________________
(4)Mg2+:__________________
(5) :__________________
说出下列数字2的含义:
(1)2O:_____________________
(2)P2O5:____________________
(3)2O3:______________________
(4)Mg2+:__________________
(5) :__________________