The chemical element whose atomic number is 1 is hydrogen (H). The formula for an acid typically contains hydrogen. In an acid, hydrogen ions (H+) are released when the acid dissolves in water. The presence of these hydrogen ions is what characterizes an acidic solution.
Acids are named based on their composition and properties. They can be categorized into various groups, such as binary acids (containing hydrogen and a nonmetallic element), oxyacids (containing hydrogen, oxygen, and another element), or organic acids (containing carbon atoms along with hydrogen and other elements).
Examples of common acids include hydrochloric acid (HCl), sulfuric acid (H2SO4), nitric acid (HNO3), acetic acid (CH3COOH), and citric acid (C6H8O7). In each of these formulas, hydrogen is present as an essential component, contributing to the acidic properties of the substance.