| − | Hydrogen can be found in the vast majority of [[organic]] compounds, as well as many [[inorganic]] compounds.<ref>For example, [[hydrocarbon]]s and metal hydrides, respectively</ref> It is an important component of [[water]] and most [[acid]]s.{{fact}} | + | Hydrogen can be found in the vast majority of [[organic]] compounds, as well as many [[inorganic]] compounds.<ref>For example, [[hydrocarbon]]s and metal hydrides, respectively</ref> It is an important component of [[water]] and most [[acid]]s because water has a chemical formula of H<sub>2</sub>O and acids donate hydrogen atoms when they react with water.<ref>https://www.britannica.com/science/acid</ref> |