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
Maria (given name) contrast, in northern Europe the name only rose to popularity after the Reformation. Because the name is so frequent in Christian tradition, a tradition of giving compound names has developed, with a number of such compounds themselves becoming very popular. Examples include Anna+Maria (Anne-Marie, Marianne, etc.) Maria+Luisa (French Marie-Louise,) Margarita+Maria (English Margaret Mary, French Marguerite Marie etc.), Maria+Antonia (Italian Maria Antonia, French Marie-Antoinette etc.) Maria+Helena (Italian Maria Elena, Spanish María Elena), Maria+Teresa, among numerous others. As a feminine given name, Maria ranked 109th in the United States as of 2015, down from rank 31 held during 1973–1975. Spelling variants of