Why are alkaline-earth metals good conductors of electricity?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

A color-coded periodic table of the elements displays each element's symbol and atomic number, with categories such as alkali metals, noble gases, halogens, transition metals, and actinoid elements distinguished by different background colors. — alkaline-earth metal Modern version of the periodic table of the elements (printable).

Alkaline-earth metals are good conductors of electricity because they are highly metallic and possess a metallic bond. In this structure, the outermost valence electrons are non-localized, meaning they are not bound to any specific atom but are free to wander throughout the entire crystal lattice.1

When an electrical field is applied to the metal, these mobile valence electrons are free to move, which facilitates the flow of electric current. While the conductivity of a metal is also influenced by factors such as electron mobility and the purity of the material, the presence of these free-moving electrons is the fundamental characteristic that enables alkaline-earth metals to conduct electricity effectively.12