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Cobalt Element Properties, Transition metals Group, Periodic Table of the Elements

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Cobalt

Cobalt Element Properties

d26
Fe
Iron
d27
Co
Cobalt
d28
Ni
Nickel
General
NameCobalt
SymbolCo
Number27
Group Number9
GroupTransition metals
Blockd
Density8.90 g/cm3
Atomic Weight58.9332 g/mol
Atomic Volume6.7 cm3/mol
Discover1737


States
StateSolid
Melting Point1768 K
Boiling Point3200 K
Triple PointNil
Critical PointNil
Heat of Fusion16.06 kJ/mol
Heat of Vaporization377 kJ/mol


Energies
First Ionization Energy758.4 kJ/mole
Second Ionization Energy1646 kJ/mole
Third Ionization Energy3232.2 kJ/mole
Electronegativity1.88
Electron Affinity63.8 kJ/mole
Specific Heat0.42 J/gK
Heat Atomization425 kJ/mole atoms


Oxidation and Electrons
Shells2,8,15,2
Electron Configuration[Ar] 3d7 4s2
Minimum Oxidation Number-1
Maximum Oxidation Number5
Minimum Common Oxidation Number0
Maximum Common Oxidation Number3


Appearance and Characteristics
Crystal Structurehexagonal
Characteristicshard
Colorbluish-white
Usesmagnets, Co glass (blue)
Hardnessmohs
ToxicityNone


Reactions
Reaction with Airmild, w/ht =>Co3O4
Reaction with 6M HClmild, =>H2, CoCl2
Reaction with 15M HNO3vigorous, =>Co(NO3)2, NOx
Reaction with 6M NaOHNone


Other Forms
Number of Isotopes1
HydrideNone
OxideCoO Co3O4
ChlorideCoCl2


Radius
Atomic Radius125 pm
Ionic Radius (1+ ion)Nil
Ionic Radius (1- ion)Nil
Ionic Radius (2+ ion)83.8 pm
Ionic Radius (2- ion)Nil
Ionic Radius (3+ ion)71.8 pm


Conductivity
Thermal Conductivity100 J/m-sec-deg
Electrical Conductivity160.256 1/mohm-cm
Polarizability7.5 A3


Abundance
SourceCo sulfides & arsenides
Relation Abundance Solar System3.352 log
Abundance Earth's Crust1.4 log


d26
Fe
Iron
d27
Co
Cobalt
d28
Ni
Nickel




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