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1 Sb
2 Mn
3 As
4 Hg
5 Sc
6 Mg
7 Bi
8 Pt
9 Pd
10 Po
11 Cd
12 Sn
13 Pb
14 Tl
15 Rn
16 Ag
17 Ga
18 Na
19 Cu
20 Li
21 Au
19
12
11
7
14
3
4
6
9
1
2
16
5
17
8
15
18
21
13
20