Book contents
- Frontmatter
- Contents
- Preface
- Part One Content description
- A Aluminum Al to Arsenic As
- B Barium Ba to Boron B
- C Cadmium Cd to Curium Cm
- D Dysprosium Dy
- E Erbium Er to Europium Eu
- F Fluorine F
- G Gadolinium Gd to Gold Au
- H Hafnium Hf to Hydrogen H
- I Indium In to Iron Fe
- K Krypton Kr
- L Lanthanum La to Lutetium Lu
- M Magnesium Mg to Molybdenum Mo
- N Neodymium Nd to Nitrogen N
- O Osmium Os to Oxygen O
- P Palladium Pd to Promethium Pm
- R Rhenium Re to Ruthenium Ru
- S Samarium Sm to Sulfur S
- T Tantalum Ta to Tungsten W
- U Uranium U
- V Vanadium V
- X Xenon Xe
- Y Ytterbium Yb to Yttrium Y
- Z Zinc Zn to Zirconium Zr
- Summary
- Part Two Content description
- Part Three Content description
- Part Four Content description
- References
- Index of elements in stars
- Index of molecules in stars
T - Tantalum Ta to Tungsten W
Published online by Cambridge University Press: 06 July 2010
- Frontmatter
- Contents
- Preface
- Part One Content description
- A Aluminum Al to Arsenic As
- B Barium Ba to Boron B
- C Cadmium Cd to Curium Cm
- D Dysprosium Dy
- E Erbium Er to Europium Eu
- F Fluorine F
- G Gadolinium Gd to Gold Au
- H Hafnium Hf to Hydrogen H
- I Indium In to Iron Fe
- K Krypton Kr
- L Lanthanum La to Lutetium Lu
- M Magnesium Mg to Molybdenum Mo
- N Neodymium Nd to Nitrogen N
- O Osmium Os to Oxygen O
- P Palladium Pd to Promethium Pm
- R Rhenium Re to Ruthenium Ru
- S Samarium Sm to Sulfur S
- T Tantalum Ta to Tungsten W
- U Uranium U
- V Vanadium V
- X Xenon Xe
- Y Ytterbium Yb to Yttrium Y
- Z Zinc Zn to Zirconium Zr
- Summary
- Part Two Content description
- Part Three Content description
- Part Four Content description
- References
- Index of elements in stars
- Index of molecules in stars
Summary
This element was discovered by A. G. Ekeberg at Uppsala, Sweden. The name comes from Tantalus, who was a god, father of Niobe.
lonization energies
Tal 7.9 eV, Tall 15.5 eV.
Behavior in stars
Tal is present in some Ba stars (Lambert 1985, Smith 1984).
Isotopes
Ta has two stable isotopes, Ta180 and Ta181, as well as 16 short-lived isotopes and isomers. In the solar system Ta181 occurs with a frequency of 99.99%.
Origin
Ta180 can be produced by the p process, the r process or the s process, Ta181 only by the r process and the s process.
This element was discovered by C. Perrier and E. Segre in Palermo, Italy, in 1937. Its name alludes to the Greek technikos (artificial).
Ionization energies
TeI 7.3 eV, TeII 15.3 eV, TcIII 29.5 eV.
No Tc lines have been observed in the sun.
Behavior in stars
Tel has its resonance lines at 4238, 4262 and 4297. It was identified by Merrill (1952) in S-type stars. The interest of this element lies in the fact that it is unstable. Its longest lived isotope has a half life of 2.6 × 106 years. The element can be produced by a neutron flux operating on iron-peak elements (Fe, Co, Ni). Such a neutron flux can be either rapid (the r process) or slow (the s process) and the isotopic form in which Tc is formed depends on the time scale in which the neutron flux occurred.
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- Chapter
- Information
- The Behavior of Chemical Elements in Stars , pp. 180 - 193Publisher: Cambridge University PressPrint publication year: 1995