1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

4n series

  1. Sep 17, 2011 #1
    Why is the Thorium decay series called 4n? I've looked it up but the explanation isn't clear
  2. jcsd
  3. Sep 17, 2011 #2


    User Avatar
    Science Advisor

    Thorium-232 and all its daughter nuclides have atomic mass numbers (number of protons plus number of neutrons) which are multiples of 4, i.e. 4n, where n is an integer.
    Last edited: Sep 17, 2011
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook