Icon of chemistry: the periodic system of chemical elements in the new century.

@article{Wang2009IconOC,
  title={Icon of chemistry: the periodic system of chemical elements in the new century.},
  author={Shu-Guang Wang and W. Schwarz},
  journal={Angewandte Chemie},
  year={2009},
  volume={48 19},
  pages={
          3404-15
        }
}
A closer look: A deeper theoretical understanding of the multifaceted periodic system of elements (PSE) has been achieved in recent years. The large energy gaps above the noble gas shells 1s(2) and np(6) (n=2-6) impress periodicity onto the whole PSE, which is complete with Period 7. The electron configurations of unbound atoms are chemically misleading. The common n+l rule is an example of the "invention of facts" even in the hard sciences. 

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