4. periode
Kalium
19
Kalsium
20
Skandium
21
Titaan
22
Vanadium
23
Chroom
24
Mangaan
25
Yster
26
Kobalt
27
Nikkel
28
Koper
29
Sink
30
Gallium
31
Germanium
32
Arseen
33
Seleen
34
Broom
35
Kripton
36
Periodieke Tabel
Taal
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