Cobalt Element Properties

Cobalt

d26
Fe
Iron
d27
Co
Cobalt
d28
Ni
Nickel
General
Name(Cobalt)
Symbol(Co)
Number(27)
Group Number(9)
Group(Transition metals)
Block(d)
Density(8.90 g/cm3)
Atomic Weight(58.9332 g/mol)
Atomic Volume(6.7 cm3/mol)
Discover(1737)


States
State(Solid)
Melting Point(1768 K)
Boiling Point(3200 K)
Triple Point(Nil)
Critical Point(Nil)
Heat of Fusion(16.06 kJ/mol)
Heat of Vaporization(377 kJ/mol)


Energies
First Ionization Energy(758.4 kJ/mole)
Second Ionization Energy(1646 kJ/mole)
Third Ionization Energy(3232.2 kJ/mole)
Electronegativity(1.88)
Electron Affinity(63.8 kJ/mole)
Specific Heat(0.42 J/gK)
Heat Atomization(425 kJ/mole atoms)


Oxidation and Electrons
Shells(2,8,15,2)
Electron Configuration([Ar] 3d7 4s2)
Minimum Oxidation Number(-1)
Maximum Oxidation Number(5)
Minimum Common Oxidation Number(0)
Maximum Common Oxidation Number(3)


Appearance and Characteristics
Crystal Structure(hexagonal)
Characteristics(hard)
Color(bluish-white)
Uses(magnets, Co glass (blue))
Hardness(mohs)
Toxicity(None)


Reactions
Reaction with Air(mild, w/ht =>Co3O4)
Reaction with 6M HCl(mild, =>H2, CoCl2)
Reaction with 15M HNO3(vigorous, =>Co(NO3)2, NOx)
Reaction with 6M NaOH(None)


Other Forms
Number of Isotopes(1)
Hydride(None)
Oxide(CoO Co3O4)
Chloride(CoCl2)


Radius
Atomic Radius(125 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 Conductivity(100 J/m-sec-deg)
Electrical Conductivity(160.256 1/mohm-cm)
Polarizability(7.5 A3)


Abundance
Source(Co sulfides & arsenides)
Relation Abundance Solar System(3.352 log)
Abundance Earths Crust(1.4 log)


d26
Fe
Iron
d27
Co
Cobalt
d28
Ni
Nickel

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