Technetium

Transition Metal

Atomic Number: 43 • Atomic Mass: 98.0000 u • Period: 5 • Group: 7

Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d⁵

Phase: Solid

Electronegativity: 1.9

History

Technetium has been known since ancient times

Predicted by Mendeleev as 'eka-manganese'

First artificially produced element (in molybdenum sent to Berkeley Lab)

Found naturally in minute amounts in uranium ores due to spontaneous fission