The element with atomic number 2 is helium. Helium is a noble gas that is colorless, odorless, and tasteless. It is the second lightest element in the periodic table, following hydrogen.
Helium is unique because it does not react with other elements due to its complete outer electron shell. This stability is what categorizes it as a noble gas. Helium is commonly used in various applications such as filling balloons, in cryogenics, and as a lifting gas in airships.
In nature, helium is primarily found in natural gas deposits and is produced in significant quantities through the nuclear fusion processes in stars. Its inert properties and low density make helium a valuable resource, both for scientific research and practical applications.