关于电子排布的一道AP化学题Consider an atom that contains an electron with the quantum numbers 3,1,0,-1/2,All that can be said about this electron is that it may exist in any element with an atomic number of 13 or greater.这句话是书

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关于电子排布的一道AP化学题
Consider an atom that contains an electron with the quantum numbers 3,1,0,-1/2,All that can be said about this electron is that it may exist in any element with an atomic number of 13 or greater.
这句话是书上的讲解,我不太明白为什么是13+而不是21+(我自己推的是21)

n=3啊,当然是第从第三周期开始了.第三周期第一个是钠~你说的21是第四周期的了