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Technetium

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Encyclopedia of Geochemistry

Part of the book series: Encyclopedia of Earth Sciences Series ((EESS))

FormalPara Element Data

Atomic symbol: Tc

Atomic number: 43

Atomic weight: ~97.91

Isotopes and abundances: no stable isotopes; 97Tc (T 1/2 = 2.6 × 106 years), 98Tc (T 1/2 = 4.2 × 106 years), 99Tc (T 1/2 = 2.1 × 105 years)

1 atm melting point: 2,157 °C

1 atm boiling point: 4,265 °C

Common valences: 7+, 4+

Atomic radius: 138 pm (covalent)

Pauling electronegativity: 1.9

First ionization energy: 702 kJ

Chondritic (CI) abundance: ~0

Silicate earth abundance: ~0

Crustal abundance: ~0

Seawater abundance: ~0

Core abundance: ~0

Properties

Technetium (Tc), with atomic number of 43, is an element between molybdenum (Mo) and ruthenium (Ru). Tc is the lightest element, which does not have any stable isotopes. The isotopes known for this element are all radioactive. The isotopes with a half-life (T 1/2) of more than 1 h are 93Tc (T 1/2 = 2.8 h; decay mode, EC + β+), 94Tc (T 1/2 = 4.9 h; EC + β+), 95Tc (T 1/2 = 20.0 h; EC + β+), 95mTc (T 1/2 = 61.0 days; EC + β+ or IT), 96Tc (T 1/2 = 4.3 days; EC + β

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References

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Author information

Authors and Affiliations

  1. Graduate School of Science, The University of Tokyo, Bunkyo, Tokyo, 113-0033, Japan

    Yoshio Takahashi

Authors
  1. Yoshio Takahashi
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Corresponding author

Correspondence to Yoshio Takahashi .

Editor information

Editors and Affiliations

  1. Department of Earth, Cornell University Department of Earth, Ithaca, New York, USA

    William M. White

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Takahashi, Y. (2017). Technetium. In: White, W. (eds) Encyclopedia of Geochemistry. Encyclopedia of Earth Sciences Series. Springer, Cham. https://doi.org/10.1007/978-3-319-39193-9_287-1

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  • DOI: https://doi.org/10.1007/978-3-319-39193-9_287-1

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-39193-9

  • Online ISBN: 978-3-319-39193-9

  • eBook Packages: Springer Reference Earth and Environm. ScienceReference Module Physical and Materials ScienceReference Module Earth and Environmental Sciences

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