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| group zero elements | |||
| element of group 0 A group of monatomic gaseous elements forming group 18 (formerly group 0) of the periodic table: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn) (构成周期表第18族(早期被称为0族)的单原子气体，包含：氦、氖、氩、氪、氙、氡。) | |||
| neutral element | |||