Technetium (Tc), element 43 – Learn Acer periodic table

Transition metal, atomic number 43.

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.

Symbol Tc. Atomic mass 98.0 u. Group 7, period 5. Electron configuration [Kr] 4d5 5s2. Electrons per shell 2, 8, 18, 13, 2. State at room temperature: Solid. Melting point 2156.8 °C, boiling point 4264.9 °C. Discovered by Emilio Segrè.

Element data from Wikipedia, CC BY-SA 3.0.

Technetium (Tc), element 43 – Learn Acer periodic table

Technetium

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