When they react with water, they release hydrogen gas and form a base. Example: Sodium hydride ( NaHcap N a cap H ), often used in organic chemistry as a powerful base. 2. Covalent (Molecular) Hydrides
Formed by many transition metals (d-block and f-block elements).
), in many hydrides, it acts as the more electronegative partner, sometimes even forming a negative anion ( H−cap H raised to the negative power hydride
They are generally grouped into three categories based on the type of chemical bond involved: 1. Ionic (Saline) Hydrides
They are being heavily researched for hydrogen storage in fuel-cell vehicles because they can soak up and release hydrogen gas like a sponge. When they react with water, they release hydrogen
These are crystalline, high-melting-point solids.
Hydrogen atoms occupy the small holes (interstices) in the metal's crystal lattice. These are crystalline, high-melting-point solids
Formed when hydrogen reacts with highly reactive alkali metals (Group 1) or alkaline earth metals (Group 2, like Calcium).