The symbol for the element hydrogen is "H." Hydrogen is the simplest and most abundant element in the universe, consisting of just one proton and one electron. It is a colorless, odorless gas at room temperature and is a primary building block for the formation of stars and molecules. Its atomic number is 1, making it the first element in the periodic table. Due to its light weight, hydrogen plays a significant role in various chemical reactions, including combustion and the formation of water. Its versatility makes it essential in industries ranging from fuel production to food processing.