Scandium
21
Sc
44.955
Protons-21
Electrons-21
Neutrons-24
Titanium
22
Ti
47.867
Protons-22
Electrons-22
Neutrons-26
Vanadium
23
V
50.941
Protons-23
Electrons-23
Neutrons-28
Chromium
24
Cr
51.996
Protons-24
Electrons-24
Neutrons-28
Manganese
25
Mn
54.938
Protons-25
Electrons-25
Neutrons-30
Iron
26
Fe
55.845
Protons-25
Electrons-25
Neutrons-30
Cobalt
27
Co
58.933
Protons-27
Electrons-27
Neutrons-32