What is the ratio of chlorine?

Answer 1

The answer will depend on the context. Are you interested in the ratio of chlorine to:

• other halides on earth (or other astronomical body),
• other chemicals in the earth (or other astronomical body),
• other elements in some compound(s),
• required to clean a swimming pool
• and so on.

But since you have not bothered to share that crucial bit of information, I cannot provide a more useful answer.