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Cobalt (Co)
Atomic number: 27 · Category: transition metal · Group 9 · Period 4 · Phase: Solid
Cobalt is a chemical element with symbol Co and atomic number 27. Like nickel, cobalt in the Earth's crust is found only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal.
Atomic mass: 58.9331944
Density: 8.9
Melting point: 1768 K
Boiling point: 3200 K
Appearance: hard lustrous gray metal
Source: Wikipedia
Block: d
Molar heat: 24.81
CPK color:#f090a0
Electronic structure
Electron configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d7
Configuration (semantic): [Ar] 3d7 4s2
Shells: 2, 8, 15, 2
Electronegativity (Pauling): 1.88
Electron affinity: 63.898
Ionization energies: 760.4, 1648, 3232, 4950, 7670, 9840, 12440, 15230, 17959, 26570, 29400, 32400, 36600, 39700, 42800, 49396, 52737, 134810, 145170, 154700, 167400, 178100, 189300, 204500, 214100, 920870, 966023
Periodic position
Group: 9
Period: 4
xpos: 9
ypos: 4
Spectral/Bohr images
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3D Model