Răspuns:
2Na + F2 => 2NaF
2Na + Cl2 => 2NaCl
2Na + Br2 => 2NaBr
2Na + I 2 => 2NaI
Mg + F2 => MgF2
Mg + Cl2 => MgCl2
Mg + Br2 => MgBr2
Mg + I2 => MgI2
2Al +3 F2=>2 AlF3
2Al +3 Cl2=>2 AlCl3
2Al +3 Br2=>2 AlBr3
2Al +3 I2=>2 AlI3
2Fe +3 F2 =>2 FeF3
2Fe +3 Cl2 =>2 FeCl3
2Fe +3 Br2 =>2 FeBr3
2Fe +3 I2 =>2 FeI3