NO. 043Transition

Tc

Technetium

Technetium is the first artificially produced element and is radioactive, mainly used in medical imaging diagnostics.

Crystal Structure

Hexagonal close-packed (hcp)

Atomic Mass98 u

Density11.5 g/cm³

Melting Point2430 K

Boiling Point4538 K

Atomic Radius136 pm

Electronegativity1.9

Ionization Energy702 kJ/mol

Electron Affinity53 kJ/mol

Bonding TypeMetallic

Oxidation States4, 6, 7

Acid/BaseCan act as acid or base

ReactivityMedium

Electron Configuration

[Kr] 4d5 5s2

Discovered ByEmilio Segrè

Year1937

Known Isotopes

Tc-99