用电子式表示下列化合物的形成过程
(1)HCl__________;
(2)NaBr______________;
(3)MgF2______________;
(4)Na2S_____________;
(5)CO2_________________;
(6)O2_____________;
(7)NH3_______________。
(1)
(2)
(3)
(4)
(5)
(6)
(7)
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