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We cannot do anything about protons, they are buried in the nucleus, but we can add or subtract electrons.
我们不能改变质子，它们埋藏在原子核内，但是我们能够增加或减少电子。
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And so we have a positive charge in the nucleus which is given by the number of protons.
在原子核上,有很多质子聚集而形成的正电荷。
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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 it is equal to the sum of the number of protons plus the number of neutrons.
它等于质子数,加上中子数。
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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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And, here, I've got 17 protons in the nucleus.
对于氯，它的原子核里有17个质子。
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The same number of electrons, but the number of protons keeps going up, up, up.
他们都是等电子，但是质子数在增加。
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It axiomatically must be 6 protons, and it has 7 neutrons.
它自然也是6个质子，有7个中子。
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So, all that's left is the helium nucleus, two protons, two neutrons.
仅留下氦核，两个质子，两个中子。
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But, I've got a nucleus with 11 protons in it.
但是我知道它的原子核中有11个质子。
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So, this has got protons and neutrons.
这里面有质子和中子。
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This is sum of protons plus neutrons.
它是质子数加上中子数。
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It has to have 6 protons.
它必须有6个质子。
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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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