Alkaline-earth metals are a group of chemical elements in the periodic table with the atomic numbers 3 to 12. These are less reactive than the alkali metals in the first column of the periodic table but more reactive than most other metals.
Alkaline-earth metals have a wide range of applications in industry, including the production of lightweight alloys, construction materials, and electronic components. They also play important biological roles, as calcium and magnesium are essential nutrients for many organisms, including humans.