从键价的概念出发，对氧化物超导体中铜离子的有效电荷进行了计算。

Effective valences of copper in superconducting oxides were calculated from the concept of bond valence.

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根据镧系元素络合物的晶体结构数据确定了单价键长R0的镧系收缩效应，并对已有的键价参数进行了系统的修订。

Based on the crystal structure data of the lanthanide complexes, lanthanide contraction of the single valance bond length R0 for Ln-O bond is confirmed.

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这个分子包含四个呈环状排列的碳原子，每两个碳原子之间形成一个三价键。

The molecule contains four carbon atoms arranged in a ring with a triple bond between two of them.

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So why don't you tell me what the valence bond description would be of these carbon hydrogen bonds?

你们来告诉我,碳氢键的价,电子是怎样的？

麻省理工公开课 - 化学原理课程节选

So to figure out bonding electrons, -- what we take is that number 18, which is our total number of electrons we need to fill valence shells, and we subtract it from our number of valence electrons, which is 10.

那么为了找出成键电子，我们将十八，也就是填满所有价壳层,所需要电子的总个数，减去我们所有的价电子的个数，也就是十。

麻省理工公开课 - 化学原理课程节选