Chromium
Symbol
Cr
Atomic Number
24
Atomic Weight
51.9961
Element Classification
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
0.488
Fusion Heat (kJ/mol)
21
Evaporation Heat (kJ/mol)
342
Thermal Conductivity (@25°C W/m K)
93.9
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
2.880
Lattice C/A Ratio
n/a
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