Technetium

Atomic symbol: Tc
Atomic number: 43
Atomic mass: (97.91)

Appearance: Shiny gray solid at 25°C

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Group: 7
Period: 5
Series: Transition metals
Block: d
Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d⁵ 5s²

A radioactive metal, in all isotopic forms, used today in nuclear medicine.

All technetium isotopes have very short half-lives: most are less than 1 hour.

Fun fact! Aptly named after the Greek word “tekhnetos” meaning artificial, technetium is the first synthetically produced element, predominantly from spent nuclear fuel rods.

https://www.softschools.com/facts/periodic_table/technetium_facts/220/