The element with the atomic number 1 is hydrogen. It is the simplest and most abundant element in the universe, consisting of just one proton and one electron. Hydrogen plays a crucial role in the cosmos, being a primary building block for stars and galaxies. In its gaseous state, hydrogen is colorless, odorless, and highly flammable. On Earth, hydrogen is commonly found in water (H2O) and organic compounds. It also has significant applications in various industries, including fuel cells, synthetic fuels, and chemical manufacturing. Researchers are exploring hydrogen as a potential clean energy source in the transition to a sustainable future.