What element is represented by the symbol H?

The symbol H represents the element hydrogen. Hydrogen is the first element on the periodic table and is characterized by having one proton in its nucleus and no neutrons in its most abundant isotope. It is the lightest and most abundant element in the universe, commonly found in stars, including the sun, where it plays a crucial role in nuclear fusion processes.

Hydrogen exists as a diatomic molecule (H₂) under standard conditions, meaning it naturally forms pairs of atoms. Its unique properties make it essential for various chemical reactions, including those involved in organic compounds and as a fuel source in hydrogen fuel cells. Understanding hydrogen's position as the simplest element helps clarify its foundational role in chemistry and thermodynamics.