Technetium
Symbol
Tc
Atomic Number
43
Atomic Weight
97.9072
Element Classification
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
0.243
Fusion Heat (kJ/mol)
23.8
Evaporation Heat (kJ/mol)
585
Thermal Conductivity (@25°C W/m K)
50.6
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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