9 or . 8 7 are possible, they actually aren't possible because even if we saw a total shielding, 1 the minimum z effective we would see is 1.
。39和0。87是可能的,实际上它们是不可能的因为即使,我们看到了一个完全的屏蔽,最小的有效电荷是。
87 Let's check. Here is sodium plus chlorine. It's 787.
我们检查一下,这是钠加上氯,是。
7 Steel is 7.87.
铁是7。
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