The element represented by 'He' on the periodic table is helium. Helium is a colorless, odorless, and non-toxic gas that is classified as a noble gas, which means it is chemically inert and does not easily react with other elements. It has an atomic number of 2 and is the second lightest and second most abundant element in the universe. Helium is commonly used in applications such as filling balloons, as a cooling medium for superconducting magnets, and in cryogenics. Its low density makes it popular for lighter-than-air applications compared to hydrogen.