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Technetium (Tc)
Element with atomic number 43, category: Transition metal, a solid at room temperature.
Element 43 of 118
Transition metal
Technetium
Group 7, Period 5
Common Uses
Medical imaging
Electron Diagram
About Technetium
Technetium is a chemical element with the symbol Tc and atomic number 43, meaning every atom has 43 protons in its nucleus. It is classed as Transition metal and is a solid at room temperature. Its atomic mass is about 98 atomic mass units (u).
On the periodic table, Technetium sits in group 7, period 5, which determines how many electron shells it has and how it tends to react with other elements.
Uses of Technetium
In daily life and industry, Technetium is used for Medical imaging. These uses are closely tied to the typical properties of elements in the Transition metal category.
Electron Structure of Technetium
Using a simplified electron shell model (at most 2 electrons in the first shell, 8 in the second, 18 in the third, and so on), Technetium has 4 electron shells, with an approximate arrangement of 2, 8, 18, 15 electrons from the innermost shell to the outermost. This is a simplified learning model, not the full electron configuration that accounts for the s, p, d and f subshells.
Explore Other Elements
Want to see another element or try the element symbol quiz? Go back to the Interactive Periodic Table to explore all 118 chemical elements.