Chromium Element Properties

Chromium

d23
V
Vanadium
d24
Cr
Chromium
d25
Mn
Manganese
General
Name(Chromium)
Symbol(Cr)
Number(24)
Group Number(6)
Group(Transition metals)
Block(d)
Density(7.19 g/cm3)
Atomic Weight(51.996 g/mol)
Atomic Volume(7.23 cm3/mol)
Discover(1798)


States
State(Solid)
Melting Point(2180 K)
Boiling Point(2944 K)
Triple Point(Nil)
Critical Point(Nil)
Heat of Fusion(21.0 kJ/mol)
Heat of Vaporization(339.5 kJ/mol)


Energies
First Ionization Energy(652.8 kJ/mole)
Second Ionization Energy(1592 kJ/mole)
Third Ionization Energy(2987.2 kJ/mole)
Electronegativity(1.66)
Electron Affinity(64.3 kJ/mole)
Specific Heat(0.45 J/gK)
Heat Atomization(397 kJ/mole atoms)


Oxidation and Electrons
Shells(2,8,13,1)
Electron Configuration([Ar] 3d5 4s1)
Minimum Oxidation Number(-2)
Maximum Oxidation Number(6)
Minimum Common Oxidation Number(0)
Maximum Common Oxidation Number(6)


Appearance and Characteristics
Crystal Structure(cubic body centered)
Characteristics(hard)
Color(silvery-white)
Uses(CrO2 tape, paint, steel)
Hardness(9 mohs)
Toxicity(No)


Reactions
Reaction with Air(None)
Reaction with 6M HCl(mild, =>H2, CrCl3)
Reaction with 15M HNO3(passivated)
Reaction with 6M NaOH(None)


Other Forms
Number of Isotopes(4)
Hydride(CrH)
Oxide(Cr2O3 CrO2 CrO3+non-stoich)
Chloride(CrCl2 CrCl3)


Radius
Atomic Radius(128 pm)
Ionic Radius (1+ ion)(Nil)
Ionic Radius (1- ion)(Nil)
Ionic Radius (2+ ion)(90.5 pm)
Ionic Radius (2- ion)(Nil)
Ionic Radius (3+ ion)(75.5 pm)


Conductivity
Thermal Conductivity(93.9 J/m-sec-deg)
Electrical Conductivity(77.519 1/mohm-cm)
Polarizability(11.6 A3)


Abundance
Source(Chromite (oxide))
Relation Abundance Solar System(4.130 log)
Abundance Earths Crust(2 log)


d23
V
Vanadium
d24
Cr
Chromium
d25
Mn
Manganese

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