Hydride

), a negatively charged ion with two electrons. This unique state makes hydrides essential for everything from cleaning lab equipment to powering future spacecraft. 1. The Three Faces of Hydrides

: Formed with transition metals like palladium or titanium. In these, hydrogen atoms actually "squeeze" into the gaps (interstices) of the metal's crystal lattice. This creates a material that can act like an alloy and conduct electricity. hydride

: Formed when hydrogen bonds with highly electropositive alkali or alkaline-earth metals (like sodium or calcium). These are typically high-melting, reactive solids that release hydrogen gas violently when they touch water. ), a negatively charged ion with two electrons

Hydrides are generally categorized by the type of chemical bond they form with other elements: hydride