Rb2O: Rb=1, O=2;
V2O5: V=5, O=2;
TiCl4: Ti=4, Cl=1;
SnO2: Sn=4, O=2;
Sr3N2: Sr=2, N=3;
Ca2Si: Ca=2, Si=4;
PBr5: P=5, Br=1;
SF6: S=6, F=1;
I2O7: I=7, O=2;
CrO3: Cr=6, O=2;
H2Te: H=1, Te=2;
AsH3: As=3, H=1;
GeO2: Ge=4, O=2;
AlH3: Al=3, H=1;
Mn2O7: Mn=7, O=2.