  Relativistic Hartree-Fock and random phase approximation methods for open
shells are used to calculate ionization potentials and static scalar
polarizabilities of eight superheavy elements with open $6d$-shell, which
include Db, Sg, Bh, Hs, Mt, Ds, Rg and Cn ($Z$=105 to 112). Inter-electron
correlations are taken into account with the use of the semi-empirical
polarization potential. Its parameters are chosen to fit the known ionization
potentials of lighter atoms. Calculations for lighter atoms are also used to
illustrate the accuracy of the approach.
