Atomic Size Limits
Is there a theoretical upper limit on the size of an
atom, and how stable are extremely large atoms predicted to be?
I'm not aware of any theoretical limit.
I'm not sure how large you are asking about, but stability is
a very difficult thing to predict for huge atoms. Relativistic
effects become important for the core electrons (especially) as
the atomic number increases, and there is no completely covariant
quantum mechanics yet that can be used to do such calculations
(at least not to my knowledge!).
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Update: June 2012