Recent progress in theoretical investigations of the electronic structure of the transactinides

An overview is given of the recent development in the theory of molecular codes focusing on a newly developed version of the Dirac-Slater discrete-variational (DS-DV) method for complex multiatomic systems. Emphasis is put on the calculations of the chemical bonding in heavy element compounds. A new model to predict complex formation and extraction of the transactinides on the basis of the DS-DV molecular-orbital calculations is presented.