4. Periode
Kalium
19
Calcium
20
Scandium
21
Titan
22
Vanadium
23
Chrom
24
Mangan
25
Eisen
26
Cobalt
27
Nickel
28
Kupfer
29
Zink
30
Gallium
31
Germanium
32
Arsen
33
Selen
34
Brom
35
Krypton
36
Periodensystem
Sprache
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