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27Co

Cobalt

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Transition metal

Atomic number27
ElementCoCobalt
Atomic mass58.933
CategoryTransition metal
Group9
Period4
Electron config[Ar] 3d7 4s2
Shells2,8,15,2
State (RT)Solid
Melting pt1495°C
Boiling pt2927°C
Electronegativity1.88
Discovered1735
Main usesMagnets, batteries, blue pigment
Co27
2 · 8 · 15 · 2
Bohr model

Group 9