1.B
2.Cd
4.Ca
5.P
6.Na
7.Mg
8.Fe
9.Ar
10.Au
11.Kr
12.Hg
13.Sn
14.Xe
15.U
16.F
17.O
18.Si
19.Ge
20.Pb
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Answer:
A.
1.B
2.Cd
4.Ca
5.P
6.Na
7.Mg
8.Fe
9.Ar
10.Au
11.Kr
12.Hg
13.Sn
14.Xe
15.U
16.F
17.O
18.Si
19.Ge
20.Pb