+2 对下列化学用语中“2”的说法正确的是（） ①2O3 �

对下列化学用语中“2”的说法正确的是（）

①2O₃ ②2N ③N₂ ④2NO₃^- ⑤Mg²⁺ ⑥Mg ⑦H₂O

A．表示分子中原子个数的是③⑦

B．表示离子所带电荷数的是⑤⑥

C．表示离子个数的是④⑤

D．表示分子个数的是①②

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+2 对下列化学用语中“2”的说法正确的是（ ） ①2O3 �

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+2 对下列化学用语中“2”的说法正确的是（） ①2O3 �