Hydrogen compounds are only required to contain carbon. However, most of them also contain hydrogen, and because it is the carbon-hydrogen bond which gives this class of compounds most of its particular chemical characteristics, carbon-hydrogen bonds are required in some definitions of the word "organic" in chemistry. Millions of hydrocarbons are known, and they are usually formed by complicated synthetic pathways that seldom involve elementary hydrogen. Compounds of hydrogen are often called hydrides, a term that is used fairly loosely. The term "hydride" suggests that the H atom has acquired a negative or anionic character, denoted H, and is used when
Edna (given name) closely related etymologically to the name Eden. Edna (given name) Edna () is a female given name originating from several languages. In Hebrew, it means "pleasure". Various women named Edna are referenced in the Old Testament apocryphal books Jubilees (where the wives of Enoch, Methuselah, and Terah are all so named) and Tobit. The name Edna may also be an Anglicized form of the Irish and Scottish name Eithne, meaning "kernel" in Gaelic. This was a very popular girl's name in the United States in the early 20th century, but has since become unfashionable. It is also a very rare