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why polonium has bigger atomic radius?

Posted: Fri Jun 29, 2012 9:45 am
by appelsinbla
Generally, the atomic radii decrease across the period. But the atomic radii values of Bi (160pm) and Po (190 pm) indicate a deviation from the trend. The Po has a bigger atomic radius value than Bi, whereas it should have a smaller one? Thanks.

Posted: Fri Jul 20, 2012 6:58 am
by KriggY
thats realy helpful.. i guess he knew that there is an exception, but he wanted to know (and I want too btw :D ) what is causing this exception