🧬ap biology review

Chlorine (Cl)

Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 examWritten by the Fiveable Content Team • Last updated September 2025

Definition

Chlorine is a chemical element with the symbol Cl and atomic number 17. It's an essential mineral for humans and is used in the process of making proteins and DNA.

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