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R - Rhenium Re to Ruthenium Ru

Published online by Cambridge University Press:  06 July 2010

Carlos Jaschek
Affiliation:
Université de Strasbourg
Mercedes Jaschek
Affiliation:
Observatoire de Strasbourg
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Summary

This element was discovered by W. Noddack, I. Tacke and O. Berg in 1925 in Berlin. Its name comes from the Rhine river, called Rhenium in Latin.

lonization energies

Rel 7.9 eV, Rell 13.1 eV, Re III 26.0 eV.

Re is not seen in the solar spectrum.

Re I was discovered by Jaschek and Brandi (1972) in one Ap star of the Cr-Eu-Sr subgroup and in another one by Guthrie (1972).

Isotopes

Re has two stable isotopes, Re185 and Re187, which occur with frequencies 37% and 63% respectively in the solar system. There exist also 18 short-lived isotopes and isomers. Re187 has a half life of 4.5 x1010 years and can be used for radioactive dating.

Origin

Re185 can be produced by the r process and the s process and Re187 only by the r process.

Type
Chapter
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Publisher: Cambridge University Press
Print publication year: 1995

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