🧬ap biology review

Cobalt

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

Cobalt is a chemical element with the symbol Co and atomic number 27. It's an essential trace mineral used by animals in making Vitamin B12, which is important for nerve function.