Răspuns:
2Na + Cl2 => 2NaCl
2Na + S=> Na2S
2Na + I2=> 2NaI
2Al + 3Cl2 => 2AlCl3
2Al + 3S => Al2S3
2Al +3 I2 => 2Al I3
2K + Cl2 => 2KCl
2K + S=> K2S
2K + I2 => 2KI