Chemical Properties of Elements and Relativistic Effecfs

The relativistic effects(the relativistic contraction,the spin-orbit splitting,the relativistic self-consistent expansion)and the influence of which on chemical properties of elements,specially on heavy elements,are explained. Relativistic quantum mechanical calculations have been made for atoms and for a few molecules,it shows that the trends of anomalous departure from per- iodic table for heavy atoms are attributed to relativistic effects,since these relativistic effects increase very rapidly with the increase of atomic number.