Sulle ragioni della non esistenza di alcuni anioni tetrossidi della prima serie di transizione

The electronic structures of $MO_4^n^-$, non existent compounds, where M indicates a 3d transition element, are studied on the basis of molecular orbital theory according to zero differential overlap scheme. A comparison of such results with those of the correspondent existent tetroxoanions furnishes some evidences, about the instability of the studied anions, in the electronic distribution features. Among them, the negative charge of the oxygen atoms increases on increasing the negative charge of the anion and suggests that this is the predominant factor affecting the stability