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    Tc

    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
    Molybdenum (Mo)Ruthenium (Ru)
    OverviewPropertiesAtomic StructureOccurrenceApplicationsHistory

    Occurrence

    Technetium is found in various natural sources, including minerals, rocks, and the Earth's crust.

    • Extremely rare in nature - only trace amounts
    • Present in uranium ores due to spontaneous fission (about 0.2 ng/kg)
    • Some evidence of natural occurrence in certain stars
    • Most technetium on Earth is artificially produced
    • Minute amounts detected in terrestrial molybdenum ores