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Zirconium


5
40
91.224
KEY
Chemical Element Symbol Key

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Zirconium
Columbia Encyclopedia
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Niobium (Nb)
Symbol: Zr
Atomic Number: 40
Atomic Weight: 91.224
Element Classification: Transition Metal
Discovered By: Martin Klaproth
Discovery Date: 1789 (Germany)
Name Origin: The mineral, zircon.
Density (g/cc): 6.506
Melting Point (K): 2125
Boiling Point (K): 4650
Appearance: Gray-white, lustrous, corrosion-resistant metal
Atomic Radius (pm): 160
Atomic Volume (cc/mol): 14.1
Covalent Radius (pm): 145
Ionic Radius: 79 (+4e)
Specific Heat (@20°C J/g mol): 0.281
Fusion Heat (kJ/mol): 19.2
Evaporation Heat (kJ/mol): 567
Thermal Conductivity (@25°C W/m K):
Debye Temperature (K): 250.00
Pauling Negativity Number: 1.33
First Ionizing Energy (kJ/mol): 659.7
Oxidation States: 4
Electronic Configuration: [Kr] 4d2 5s2
Lattice Structure: Hexagonal (HEX
Lattice Constant (Å): 3.230
Lattice C/A Ratio: 1.593


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