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There are: 21/3 = 7
28 3s
its clearly 8 3 6 9 12 15 18 21 4
9
3000/3 = 1000
24 of them
7
The are two electrons in the 3s orbital of magnesium (Mg.)
It could be: 33-(3+3) = 21
0.1429
4
16
37.6666667
2,560