43 Tc 98
Technetium
transition metal
Properties
- Atomic number
- 43
- Atomic mass
- 98 u
- Category
- transition metal
- Group
- 7
- Period
- 5
- Block
- d-block
- State (room temp)
- Solid
- Outer-shell electrons
- 2
- Electronegativity
- 1.9 (Pauling)
- Density
- 11 g/cm³
- Melting point
- 2156.85 °C
- Boiling point
- 4264.85 °C
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d⁵
Noble-gas shorthand: [Kr] 4d⁵ 5s²
Electrons per shell: 2, 8, 18, 13, 2 — that's 2 in the outermost shell.
About Technetium
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.
- Discovered by Emilio Segrè
- Appearance: shiny gray metal
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.