Level 18
Level 20
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Gallium
31
Germanium
32
Arsenic
33
Selenium
34
Bromine
35
Krypton
36
Rubidium
37
Strontium
38
Yttrium
39
Zirconium
40
Niobium
41
Molybdenum
42
Technetium
43
Ruthenium
44
Rhodium
45
