Helium is the lightest of the rare gasesRare gases. As a rare gas it is chemically inactive and is only bound to other atoms, other helium atoms included, by weak and non-directional forces.

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He Droplets

  • Klavs Hansen

摘要

Helium is the lightest of the rare gasesRare gases. As a rare gas it is chemically inactive and is only bound to other atoms, other helium atoms included, by weak and non-directional forces.