Technetium (Tc)
Technetium (Tc, element 43) is a transition metal in group 7, period 5. Atomic mass 98, electron configuration [Kr] 4d⁵ 5s², uses and facts.
About Technetium
Technetium is a transition metal with the symbol Tc and atomic number 43. It is a solid at room temperature, and it sits in group 7, period 5 of the periodic table. Technetium was discovered in 1937 by Carlo Perrier.
Technetium key facts
- Atomic number: 43
- Symbol: Tc
- Atomic mass: 98 u
- Category: transition metal
- Group: 7
- Period: 5
- State at room temperature: solid
- Electron configuration: [Kr] 4d⁵ 5s²
- Electronegativity (Pauling): 1.9
- Melting point: 2430 K (2156.85 °C)
- Boiling point: 4538 K (4264.85 °C)
- Density: 11.5 g/cm³
- Common oxidation states: −3, −1, 0, +1, +2, +3, +4, +5, +6, +7
Electron configuration
The electron configuration of technetium is [Kr] 4d⁵ 5s². The part in brackets is the noble gas core; the rest shows how the outer electrons fill their subshells.
Uses of technetium
- Medical imaging
- Superconductors
- Corrosion inhibitor (research)
Did you know?
First element to be artificially produced. Technetium-99m is used in millions of medical imaging scans every year.
Other elements in group 7 and neighbours
Frequently asked questions
What is the atomic number of technetium?
The atomic number of technetium is 43, which means every technetium atom has 43 protons.
What is the electron configuration of technetium?
The electron configuration of technetium is [Kr] 4d⁵ 5s².
What group and period is technetium in?
Technetium is a transition metal in group 7, period 5.
What state is technetium at room temperature?
Technetium is a solid at room temperature.
What is technetium used for?
Technetium is used for medical imaging, superconductors, corrosion inhibitor (research).