  The multiconfiguration Dirac-Hartree-Fock (MCDHF) method was employed to
calculate atomic electric dipole moments (EDM) of the superheavy element
copernicium (Cn, $Z=112$). The EDM enhancement factors of Cn, here calculated
for the first time, are about one order of magnitude larger than those of Hg.
The exponential dependence of enhancement factors on atomic number $Z$ along
group 12 of the periodic table was derived from the EDMs of the entire homolog
series, $^{69}_{30}$Zn, $^{111}_{\phantom{1}48}$Cd, $^{199}_{\phantom{1}80}$Hg,
$^{285}_{112}$Cn, and $^{482}_{162}$Uhb. These results show that superheavy
elements with sufficiently large half-lives are good candidates for EDM
searches.
