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Chromium


4
24
51.9961
KEY
Chemical Element Symbol Key

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Chromium
Columbia Encyclopedia
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Symbol: Cr
Atomic Number: 24
Atomic Weight: 51.9961
Element Classification: Transition Metal
Discovered By: Louis Vauquelin
Discovery Date: 1797 (France)
Name Origin: Greek: chroma (color).
Density (g/cc): 7.18
Melting Point (K): 2130
Boiling Point (K): 2945
Appearance: Very hard, crystalline, steel-gray metal
Atomic Radius (pm): 130
Atomic Volume (cc/mol): 7.23
Covalent Radius (pm): 118
Ionic Radius: 52 (+6e) 63 (+3e)
Specific Heat (@20°C J/g mol): 0.488
Fusion Heat (kJ/mol): 21
Evaporation Heat (kJ/mol): 342
Thermal Conductivity (@25°C W/m K):
Debye Temperature (K): 460.00
Pauling Negativity Number: 1.66
First Ionizing Energy (kJ/mol): 652.4
Oxidation States: 6, 3, 2, 0
Electronic Configuration: [Ar] 3d5 4s1
Lattice Structure: Body-Centered Cubic (BCC
Lattice Constant (Å): 2.880
Lattice C/A Ratio: n/a


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