Na2 + 2 Cl → 2 NaCl
This is an oxidation-reduction (redox) reaction:
2 Na0 - 2 e- → 2 NaI (oxidation)
2 Cl0 + 2 e- → 2 Cl-I (reduction)
Na2 is a reducing agent, Cl is an oxidizing agent.
Warning: Unknown compound 'Na2'
Warning: Unknown compound 'Cl'