To determine what type of hydride NaH is, let's explore the different categories of hydrides:
Electron-rich hydrides: These contain more electrons than needed for the covalent bonds and usually possess lone pairs of electrons. Examples include hydrides of group 15-17 elements like NH3 (ammonia), H2O (water), and HF (hydrogen fluoride).
Molecular hydrides: Generally, these are covalent compounds formed with non-metals. They exist as discrete molecules like CH4 (methane) or H2S (hydrogen sulfide).
Saline hydrides: These are ionic compounds formed between hydrogen and alkali or alkaline earth metals. They are often formed with metals from group 1 or group 2 of the periodic table. Sodium hydride (NaH) is a classic example, where Na+ and H- form ionic bonds.
Metallic hydrides: These are formed with transition metals and do not have a definite stoichiometry, like TiH2 or Palladium hydride.
NaH is formed by the combination of sodium (Na), an alkali metal, and hydrogen (H). The bond between sodium and hydrogen is ionic, where sodium donates an electron to form Na+ and hydrogen accepts an electron to form H-, resulting in the formation of a saline or ionic hydride.
