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WTA : does atomic mass matter to atom's radius?

  1. May 31, 2015 #1
    1. The problem statement, all variables and given/known data
    so my friend asked this question: "what's the atomic radius ratio between He-3 and He-4?"
    2. Relevant equations

    all i know is this equation : r =nh/mv
    3. The attempt at a solution

    i thought the ratio will be same because both He-3 and He-4 have only two electrons. Correct me if im wrong please
     
  2. jcsd
  3. May 31, 2015 #2
    Nuclear radius will be different but atomic radius will remain the same. As atomic radius is the distance between the center of the nuclei to the outermost electron-which is same for both.

    ratio is 1 and 'not same'
     
  4. May 31, 2015 #3
    so to make clear things the ratio of atomic radius is same but the nuclear radius isnt same right?
     
  5. May 31, 2015 #4
    You should actually say atomic radius of both are same and ratio is 1.
    yes. You can understand it by the formula:

    R=R_0*A^(1/3)

    where A-Mass number, R_0 is a constant
     
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