Periodic Table Guide
Magnesium (Mg) has atomic number 12 and is classified as a alkaline earth metal. It sits in Group 2, period 3 of the periodic table. Its practical relevance includes lightweight alloys, desulfurization, refractories, pyrotechnics and sacrificial anodes.
Quick facts
Position in the periodic table
Alkaline earth metals are reactive s-block metals that commonly form +2 ions. Their compounds are important in construction, refractories, metallurgy, chemicals and biological systems.
Magnesium belongs to period 3. Its position helps explain recurring trends such as atomic size, bonding behavior, oxidation states and the way it interacts with neighboring elements.
Why Magnesium matters
In engineering and technology, magnesium is associated with lightweight alloys, desulfurization, refractories, pyrotechnics and sacrificial anodes. The importance of the element may come from the pure element itself, from compounds containing it, or from its role as an alloying, electronic, catalytic or nuclear material.
Engineering and scientific context
Material behavior should never be inferred from the element name alone. Purity, isotope composition, crystal structure, processing history, temperature and the surrounding chemical environment can all change performance. In alloys and compounds, the contribution of magnesium depends on concentration and interaction with the other constituents.
Safety and handling
The hazards associated with Magnesium depend on its physical form, purity, compounds, process temperature and exposure route. Engineering decisions should use the applicable safety data sheet and project-specific risk assessment.
Related elements
Beryllium (Be) · Calcium (Ca) · Strontium (Sr) · Sodium (Na)
Reference sources
For authoritative element data and current standard atomic-weight guidance, consult the Royal Society of Chemistry Periodic Table and the IUPAC Periodic Table of the Elements.
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