Technetium

Symbol: Tc
Atomic Number: 43
Atomic Weight: 97.9072
Element Classification: Transition Metal
Discovered By: Carlo Perrier, Emilio Segre
Discovery Date: 1937 (Italy)
Name Origin: Greek: technetos (artificial).

Density (g/cc): 11.5
Melting Point (K): 2445
Boiling Point (K): 5150
Appearance: Silvery-gray metal
Atomic Radius (pm): 136
Atomic Volume (cc/mol): 8.5
Covalent Radius (pm): 127
Ionic Radius: 56 (+7e)
Specific Heat (@20C J/g mol): 0.243
Fusion Heat (kJ/mol): 23.8
Evaporation Heat (kJ/mol): 585
Thermal Conductivity (@25C W/m K):
Debye Temperature (K): n/a
Pauling Negativity Number: 1.9
First Ionizing Energy (kJ/mol): 702.2
Oxidation States: 7
Electronic Configuration: [Kr] 4d6 5s1
Lattice Structure: Hexagonal (HEX)
Lattice Constant (): 2.740
Lattice C/A Ratio: 1.604

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