The genome starts piling on mutations that mean nothing; that's how they date the branches of the genome, by looking at the number of neutral mutations.

基因积累了许多无意义的突变,这就是他们如何鉴定基因分支的年代,看中性突变的数量就行了

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So, let's say we have an atomic number of 3, 3 that means we have 3 electrons, so we better hope to get our neutral atom that we have a charge of plus 3in the nucleus.

这也是很合理的，因为Z就是原子序数，假设原子序数是，那就有3个电子，那我们就希望,性原子有个带3个正电荷的原子核。

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Z Number of protons in the nucleus, this is number of protons in the nucleus, which in the neutral atom is equal to the number of electrons.

质子数。，Z，proton，number。,原子核中的质子数，这是原子核的质子数，在中性原子中，等于,电子数。

麻省理工公开课 - 固态化学导论课程节选