He" on the periodic table stands for the chemical element Helium. Helium is a noble gas and is the second lightest element in the periodic table, with an atomic number of 2. It is a colorless, odorless, and non-toxic gas that is lighter than air. Helium is known for its low boiling and melting points, and it is used in various applications, including cryogenics, balloons, airships, and as a protective gas in certain industries.