书写化学结构式时，怎样计算共价键个数？ 给了一个分子的化学式，怎么判断它里面的共价键是π键还是σ键？
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在中学阶段，共价键的个数就是形成的公用电子对的对数，你数数共用电子对的对数，也就是化学结构式中线的条数例如，F-F就是有一个健，代表两个原子之间有几条线就是有几个共价键。O=O就是2个健。
数有几条线
结构式里你画了几个线就是几个键。。。
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