• Exclusive

    Hey Guest, unlock an instant 10% bonus discount when you upgrade via the Crypoverse gateway.

    Claim Discount →

229m

Recent contents View information Top users
Thorium (90Th) has seven naturally occurring isotopes but none are stable. One isotope, 232Th, is relatively stable, with a half-life of 1.405×1010 years, considerably longer than the age of the Earth, and even slightly longer than the generally accepted age of the universe. This isotope makes up nearly all natural thorium, so thorium was considered to be mononuclidic. However, in 2013, IUPAC reclassified thorium as binuclidic, due to large amounts of 230Th in deep seawater. Thorium has a characteristic terrestrial isotopic composition and thus a standard atomic weight can be given.
Thirty-one radioisotopes have been characterized, with the most stable being 232Th, 230Th with a half-life of 75,380 years, 229Th with a half-life of 7,917 years, and 228Th with a half-life of 1.92 years. All of the remaining radioactive isotopes have half-lives that are less than thirty days and the majority of these have half-lives that are less than ten minutes. One isotope, 229Th, has a nuclear isomer (or metastable state) with a remarkably low excitation energy, recently measured to be 8.28 ± 0.17 eV. It has been proposed to perform laser spectroscopy of the 229Th nucleus and use the low-energy transition for the development of a nuclear clock of extremely high accuracy.The known isotopes of thorium range in mass number from 207 to 238.

View More On Wikipedia.org
Top Bottom
    • Tools : Download Tools from our Resources.
    Configs : Download Configs[ob/ob2/svb/cyb/anom].
    Memes : Bored? Lets have some Memes (⁠◠⁠‿⁠◕⁠)
    Crax.Tube : 1st LEARN... Then remove the "L".
    NSFW : I stay away from the internet as much
                                               as I can. Except for PORN.
    Upgrade : Just £15 to access everything NOW!
    Earn : Low on Money?Start Earning from Crax Now!
    Crax.Shop : Buy/Sell without getting Scammed 💯