AlCl3 clorura de aluminiu
CuCl2 clorura cuprica
Li Cl clorura de litiu
BaCl2 clorura de bariu
CaCl2 clorura de calciu
PbCl4 clorura plumbica
Al2O3 oxid de aluminiu
CuO oxid cupric
Li2 O oxid de litiu
BaO oxid de bariu
CaO oxid de calciu
PbO2 oxid plumbic
PH3 [ 1. 3=3 ----> P are valenta 3 ]
SO3 [ 3 .2 6 -----> S are 6 ]
MgCl2 [1.2=2--------> Mg are 2 ]
SiO2 [ 2.2=4--------> Si are 4 ]
HCl [1.1=1 -------> Cl are 1]
Cl2O7 [ 2.7=14
14:2=7-----> Cl are 7]
