The most abundant element in nature is hydrogen. It makes up about 93% of the ordinary matter in the universe. Hydrogen is a colorless, odorless, tasteless, non-metallic gas with a chemical symbol H. It has an atomic number of 1 and an atomic mass of 1.00794 u. Hydrogen is the first element on the periodic table and is the lightest and most abundant element. It is found in all forms of matter and is essential for life.