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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。
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And note that as Z increases, as the proton number increases the radius decreases for a given n number.
并注意到当Z不断增加，对于一个给定的n，即当质子数增加的时候,半径的n值就减小了。
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Maybe not. It has no protons, so therefore, it has no electrons Because proton number equals electron number, which means if it has no protons 0 its atomic number is zero.
也可能不会，这个元素没有质子，因此，也没有电子,因为质子数等于电子数，意味着它没有质子,它的原子序数为。
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So we get at the number of neutrons indirectly because we know the proton number here.
所以，我们可以间接得到中子数,因为我们知道质子数了。
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And, that's equal to the product of e the proton number times e.
正等价于,质子数乘以。
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The proton number is in the lower left corner.
质子数是在左下方。
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And we began with the proton number.
我们从质子数开始。
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They all have the same Z, the same proton number, but different A, which means number of neutrons varies.
有相同的Z，相同的质子数，但是不同的A，也就是中子数不同。
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This means you can vary the neutron number without changing chemical identity, because chemical identity is fixed by the proton.
这表示你可以改变中子数,而不会改变它的化学特性，因为化学特性是由质子决定的。
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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。
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