Cu-3d electrons and O-2p electrons tend to form covalent bonds, but the center of gravity of the electron distribution is biased toward Cu ions, indicating that Cu-O bonds have some ionic characteristics.
The covalent bond between cu-3d electron and o-2p electron tends to form, but the center of gravity of electron distribution tends to Cu ion, indicating that Cu-O bond has the characteristics of partial ion bond.
Covalent bonds tend to form between Cu-3d electrons and O-2p electrons, but the center of gravity of electron distribution tends to Cu ions, which indicates that Cu-O bonds have the characteristics of partial ionic bonds.