掌握化学用语是学好化学的关键。下列化学用语与所表述的意义相符

掌握化学用语是学好化学的关键。下列化学用语与所表述的意义相符合的是( )

FeCl2—氯化亚铁 ②2Ca22个钙离子 ③O22个氧原子 —钠离子 ⑤H2O1个水分子 ⑥2H—2个氢元素 2—氮气中氮元素的化合价为零

A.①④⑤⑦  B.②③④⑥

C.①②⑤⑦  D.②⑤⑥⑦

答案

C

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