Name:  Technetium

Atomic Symbol and Mass Number:Tc [43]

Electron Configuration: [Kr] 4d   5s

Atomic Radii: 183 pm

Electron Affinity: 53 kJ mol-1

Oxidation states: +7, +6, +4

Electronegativity value: 1.9

Elemental Group: Transition Metal

Uses and properties:

• Highly radioactive

• Rare, silver-gray metal that tarnishes slowly in moist air

• Dissolves in nitric acid and concentrated sulfuric acid

• Insoluble in hydrochloric acid of any strength

• Excellent superconductor at temperatures below 11 K

• No stable isotopes

• Technetium-99m is mostly used in diagnostic procedures that use radioactive elements

• Radioactive tracer (Tc-95)

• Equipment calibration (Tc-99)

• Protect carbon steels and iron in closed systems from corrosion

 

Lewis diagram: