Helium is a chemically inert, monoatomic noble gas (atomic number 2) characterized by a completely filled 1s electron shell, extremely low polarizability, and the highest ionization energy among all elements. In research contexts, it serves as an idealized almost‐noninteracting gas and a quantum fluid, especially in its isotopes ³He and ⁴He at cryogenic temperatures, where phenomena such as superfluidity, Bose–Einstein condensation of quasiparticles, and quantum vortices are studied. Its low boiling point and high thermal conductivity make helium a critical medium in low-temperature physics, high-resolution spectroscopy, gas-phase reaction dynamics, and as a carrier or buffer gas in various analytical and plasma-based techniques.
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