
Period 4 elements
Period 4 is the first row where transition metals appear. It runs from potassium to krypton and includes iron, copper, zinc and nickel - the metals that power everything from kitchen knives to electric grids.
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19
39.0983
K
Potassium
Alkali Metal
20
40.0784
Ca
Calcium
Alkaline Earth Metal
21
44.9559
Sc
Scandium
Transition Metal
22
47.8671
Ti
Titanium
Transition Metal
23
50.9415
V
Vanadium
Transition Metal
24
51.9962
Cr
Chromium
Transition Metal
25
54.938
Mn
Manganese
Transition Metal
26
55.8452
Fe
Iron
Transition Metal
27
58.9332
Co
Cobalt
Transition Metal
28
58.6934
Ni
Nickel
Transition Metal
29
63.5463
Cu
Copper
Transition Metal
30
65.382
Zn
Zinc
Transition Metal
31
69.7231
Ga
Gallium
Post-Transition Metal
32
72.6308
Ge
Germanium
Metalloid
33
74.9216
As
Arsenic
Metalloid
34
78.9718
Se
Selenium
Nonmetal
35
79.901
Br
Bromine
Nonmetal
36
83.7982
Kr
Krypton
Noble Gas