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Cl2O7- Cl(VII) O(II)
N2O5- N(V) O(II)
CO2- C(IV) O(II)
AlCl3- Al(III) Cl(I)
SO3- S(VI) O(II)
Al2S3- Al(III) S(II)
Cu2O- Cu(I) O(II)
PH3-P(III) H(I)
BaO- Ba(II) O(II)
CuCl2- Cu(II) Cl(I)
2. XCl2=111u
X+2*35,5u=111u
X+71u=111u
X=40 u
Ten pierwiastek to wapń (Ca)
Wzór- CaCl2
3. XO2=239u
X+2*16u=239u
X+32u=239u
X=207u
Wzór sumaryczny- PbO2
Wzór strukturalny O=Pb=O