Period 4
4 elements in this period. All elements in the same period occupy the same number of electron shells.
18 elements
19
K
Potassium
39.098
20
Ca
Calcium
40.08
21
Sc
Scandium
44.956
22
Ti
Titanium
47.867
23
V
Vanadium
50.941
24
Cr
Chromium
51.996
25
Mn
Manganese
54.938
26
Fe
Iron
55.84
27
Co
Cobalt
58.933
28
Ni
Nickel
58.693
29
Cu
Copper
63.55
30
Zn
Zinc
65.4
31
Ga
Gallium
69.723
32
Ge
Germanium
72.63
33
As
Arsenic
74.922
34
Se
Selenium
78.97
35
Br
Bromine
79.9
36
Kr
Krypton
83.8
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