9s - 9
21 5s
In a neutral zinc atom, there are 2 electrons in the 4d orbital and 2 electrons in the 4s orbital. Therefore, there are no 5s electrons in a zinc atom.
There is really not a big difference between the iPhone 5s and the iPhone 4s. The only thing different between the phones would be the screen size.
20 4s go into 80.
103.4
105 of them.
35 of them.
20
90000 of them.
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Exactly 200 of them