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English: Covalent hydrides are most all compounds of hydrogen and nonmetallic elements; they include the super-greenhouse gas methane (CH4), Beryllium hydride, hydrogen sulfide (H2S), ammonia (NH3), and water (H2O). In covalent hydrides, hydrogen is covalently bonded to more electropositive element such as p-block (boron, aluminium, and Group 4-7) elements as well as beryllium. Common compounds include the hydrocarbons and ammonia could be considered as hydrides of carbon and nitrogen, respectively. Charge neutral covalent hydrides that are molecular are often volatile at room temperature and atmospheric pressure. Some covalent hydrides are not volatile because they are polymeric—i.e. nonmolecular—such as the binary hydrides of aluminium and beryllium.
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