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, which is 2 in the outermost shell.
Related: electron configuration, the Bohr model, valence electrons.
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
Technetium: frequently asked questions
- What is Technetium?
- Technetium (Tc) is the chemical element with atomic number 43. It is a metal: specifically a transition metal.
- What is the atomic number of Technetium?
- Technetium's atomic number is 43, which means every Technetium atom has 43 protons in its nucleus.
- What is the electron configuration of Technetium?
- The electron configuration of Technetium is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d5 (noble-gas shorthand: [Kr] 4d5 5s2). Its electrons are arranged in shells of 2, 8, 18, 13, 2, with 2 in the outermost shell.
- Is Technetium a metal or a nonmetal?
- Technetium is a metal: specifically a transition metal.
- What group and period is Technetium in?
- Technetium is in group 7 and period 5 of the periodic table.
- Is Technetium a solid, liquid, or gas?
- At room temperature, Technetium is a solid.
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.