Answer
$Cl: 0$
Work Step by Step
All atoms in their elemental state have an oxidation state of 0 therefore the Cl has an oxidation state of 0.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.