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用化学用语填空． （1）铝元素 ； （2）氯化镁中镁元素显+2价 ； （3）铵根离子 ； （4）天然气的主要成分 ．
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用化学用语填空.12个氩原子2银元素3硝酸根离子4标出氯化铝中铝元素的化合价.
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MgCl
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+2
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O
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2
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下列化学用语与含义相符的是
MgCl
2
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2H——2个氢元素
O
2
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2
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+2
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