Hydrogen is a chemical element represented by the symbol “H” in the periodic table. It is the first element on the table. It is also the lightest and most abundant element in the universe, making up about 75% of its elemental mass. Hydrogen is odorless, colorless, and highly flammable in its pure form.

In nature, hydrogen is rarely found in its elemental form but is usually combined with other elements such as oxygen in water (H₂O) or carbon in hydrocarbons. It is a key component of many organic compounds and plays a crucial role in various biological and chemical processes.