unpaired electron

A free radical is a molecular fragment having an unpaired electron.

自由基是一种具有未配对电子的分子碎体.

词典精选例句

There are B-H bond, H-H bond and atom-molecular bond in BH+ 4 and BH4. There are four equivalent B-H bonds in BH-4. In the case of BH4 there is an unpaired electron that occurs near the boron atom.

BH4+和BH4中都存在B H键、H H键和原子-分子键；而BH4-中存在着四个相同的B H键；

互联网摘选

Conclusion The negative Eh on decayed tooth surface is related to the high concentration of superoxide free radicals and the unpaired electron of free radicals is the basis for negative Eh formation.

结论龋变牙面出现Eh负电位与龋变组织内含有高浓度超氧化物阴离子自由基有关，自由基的未配对的电子是形成Eh负电位的物质基础。

互联网摘选

And what I want to point out that we just figured out for molecular orbital theory, is that o2 is a biradical, because remember, the definition of a radical is when we have an unpaired electron.

我要指出的是，我们刚利用分子轨道理论，指导了O2是二价自由基，因为记住，自由基的定义是，有个未配对的电子。

互联网摘选