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
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
23.8
Evaporation Heat(kj/mol)
585
Thermal Conductivity(@25°C W/m K)
50.6
Debye Temperature
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
