Tc
Technetium
Transition MetalAtomic Number: 43 • Atomic Mass: 98.0000 u • Period: 5 • Group: 7
Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d⁵
Phase: Solid
Electronegativity: 1.9
Physical & Chemical Properties
Physical Properties
- •Silvery-gray radioactive metal
- •Resembles platinum in appearance
- •Superconductor below 7.46 K
- •High melting point (2430 K or 2157°C)
- •Density comparable to lead
Melting Point
2430 K (2156.85 °C, 3914.33 °F)
Boiling Point
4538 K (4264.85 °C, 7708.73 °F)
Density
11.5 g/cm³
Electronegativity
1.9 (Pauling scale)
Chemical Properties
- •Multiple oxidation states from -1 to +7
- •Slowly tarnishes in moist air
- •Dissolves in aqua regia, nitric acid, and concentrated sulfuric acid
- •Forms the pertechnetate ion (TcO₄⁻) in solution
- •Can form volatile heptoxide (Tc₂O₇)
Electron Configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d⁵Electron configuration describes how electrons are distributed in atomic orbitals, showing how they are arranged in energy levels and subshells.