๐Ÿงชap chemistry review

Magnesium

Written by the Fiveable Content Team โ€ข Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 examโ€ขWritten by the Fiveable Content Team โ€ข Last updated September 2025

Definition

Magnesium is a chemical element with atomic number 12 and symbol Mg. It belongs to Group 2 (alkaline earth metals) in the periodic table and has two valence electrons.