You can do a number of things to protect yourself from the effects of carbon monoxide.

VOA: special.2011.01.25

So carbon 12. We know that it has the proton number, by definition, is 6. And the neutron number, 6 from 12 is 6. So it has 6 protons and 6 neutrons.

所以碳12，我们知道它有质子数，根据定义，那就是6，而电子数，12减6等于6，所以它有6个中子。

麻省理工公开课 - 固态化学导论课程节选

So, if we want to figure out the formal charge on the carbon, we need to take the number of valence electrons, so that's 4. We need to subtract the lone pair, what number is that? It's 2.

如果我们想算出碳原子的形式电荷，我们需要将价电子的个数，也就是四，减去孤对电子的个数，它是多少？是二。

麻省理工公开课 - 化学原理课程节选

This is the number of carbons there is in a mole of carbon.

这是碳的数量,这是一摩尔的碳。

麻省理工公开课 - 固态化学导论课程节选

They'd like to be able to refer to each carbon separately so they can talk about reactions with this molecule, so they number the carbons.

为了在探讨这种大分子的,化学反应时能清楚地,表示每一个碳原子,人们对碳原子进行了编号

耶鲁公开课 - 生物医学工程探索课程节选

The phosphate is linked to this carbon on the pentose, and notice that there is a number on this carbon, it's called - it's the 5' carbon.

磷酸基连接在戊糖的一个碳原子上,注意在这个碳上有个数字,它叫做5'碳

耶鲁公开课 - 生物医学工程探索课程节选