The reaction between sodium (Na) and Hydrogen (H2) results in the formation of Sodium Hydride (NaH). This reaction is an example of a metal-nonmetal reaction, where the highly reactive sodium metal loses electrons to the highly electronegative hydrogen gas. The chemical equation for this reaction can be written as:

Na + 1/2 H2 -> NaH

In this equation, one atom of sodium reacts with half a molecule of hydrogen gas to produce one molecule of Sodium Hydride. The reaction typically occurs at elevated temperatures and can release heat and light, making it an exothermic reaction.

When sodium metal is brought into contact with hydrogen gas under appropriate conditions, the sodium atoms readily lose their outermost electron to the hydrogen molecules. This results in the formation of positively charged sodium ions (Na+) and negatively charged hydrogen ions (H-). The electrostatic attraction between these ions leads to the formation of ionic bonds, resulting in the formation of Sodium Hydride (NaH).

Sodium Hydride is a white or colorless crystalline substance that is highly reactive. It is an ionic compound, with sodium cations (Na+) and hydride anions (H-). NaH is often used as a reducing agent in various chemical reactions, particularly in organic synthesis. It is also commonly employed as a source of hydrogen gas in certain industrial processes.