3．（2分）Na2O的电子式为（ ）
A．B．
C．D．
化学式、结构式与电子式 · 历年高考化学真题与解析
本页汇总 高考真题检索 的「化学式、结构式与电子式」高考化学真题共 4 道，覆盖 2008–2022 年；含完整答案与解析。
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2.反应 $3 2 4 28NH 3Cl 6NH Cl N=+ +$可用于氯气管道的检漏。下列表示相关微粒的化学用语
正确的是
1.水的分子式是
A.H2 B O 2 C H 2O D CO 2
2.．（08上海卷）化学科学需要借助化学专用语言来描述，下列有关化学用语正确的是（
）
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