Answer:
Chlorine is a halogen this means that it lacks 1 electron to reach electronic configuration of noble gas and be stable, therefore it is very electronegative, this means that it has a high tendency to gain electrons
Since only one electron is missing to reach a noble gas configuration, it tends to gain an electron to be stable and has no tendency to transfer electrons
The oxidation number is what tells us the number of electrons that an atom receives or makes available to others
The oxidation number of chlorine is -1 (as it is negative it means that it receives the electrons)
