1. Mar 18, 2007 #1

   hlxworenwei

   

   Pb2+, La3+, Ti4+, O2-
   
   I am very grateful for your help!

    

   hlxworenwei, Mar 18, 2007
2. 
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3. Mar 21, 2007 #2

   interested_learner

   

   Atoms don't have precise radii. See:
   
   http://www.chemguide.co.uk/atoms/properties/atradius.html
   
   and
   
   http://en.wikipedia.org/wiki/Ionic_radius
   
   for good discussions.

    

   interested_learner, Mar 21, 2007
4. Mar 25, 2007 #3

   Astronuc

   

   Staff: Mentor

   Webelements has such information.
   
   
   For example -
   
   http://www.webelements.com/webelements/elements/text/Pb/radii.html
   
   http://www.webelements.com/webelements/elements/text/La/radii.html
   http://www.webelements.com/webelements/elements/text/La/vrad.html
   
   Just substitute the element's symbol in the links. Note that there are different ways to measure the radius, or the radius depends on the compound.

    

   Astronuc, Mar 25, 2007

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