#43
Technetium
transition metal· Solid·98 u
Technetium (/tɛkˈniːʃiəm/) is a chemical element with symbol Tc and atomic number 43. It is the element with the lowest atomic number in the periodic table that has no stable isotopes:every form of it is radioactive. Nearly all technetium is produced synthetically, and only minute amounts are found in nature.
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Identity
- Symbol
- Tc
- Atomic Number
- 43
- Atomic Mass
- 98 u
- Category
- transition metal
- Block
- d-block
- Period
- 5
- Group
- 7
- Appearance
- shiny gray metal
- Year Discovered
- 1937 CE
- Discovered By
- Emilio Segrè
- Named By
- technique
Electrons
- Configuration
- [Kr] 4d5 5s2
- Full Configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d5
- Shells
- 2, 8, 18, 13, 2
- Electronegativity
- 1.9
- Electron Affinity
- 53
- Oxidation States
- +7, +6, +4
- Ionization Energies
- 702, 1470, 2850
Physical Properties
- State at
- Solid
- Melting Point
- 2430
- Boiling Point
- 4538
- Density
- 11
- Molar Heat
- 24.27 J/(mol·K)
- Crystal Structure
- HEX
- Magnetic Ordering
- Paramagnetic
Mechanical
- Atomic Radius
- 183 pm
- Covalent Radius
- 147 pm
- Van der Waals
- 209 pm
- Metallic Radius
- 136 pm
- Bulk Modulus
- 297 GPa GPa
- Shear Modulus
- 85 GPa GPa
- Young's Modulus
- 230 GPa GPa
Thermal & Electrical
- Thermal Conductivity
- 50.6 W/(m K) W/(m·K)
- Electrical Conductivity
- 6.7 MS/m S/m
- Specific Heat
- 210 J/(kg K) J/(g·K)
- Heat of Vaporization
- 550 kJ/mol kJ/mol
- Heat of Fusion
- 33.3 kJ/mol kJ/mol
Abundance
- Universe
- 0
- Sun
- 0
- Meteorite
- 0
- Earth's Crust
- 0
- Ocean
- 0
- Human Body
- 0