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1 Sb
2 Sr
3 Mn
4 Mg
5 Ge
6 Al
7 As
8 Am
9 Rb
10 Sn
11 Fe
12 Fr
13 Br
14 Er
15 Xe
16 Cl
17 Ca
18 Na
19 Li
20 Pb
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11
20
10
7
14
17
12
5
3
18
16
15
2
13
9
4
19
1
6