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нечётный (немецкий: Gerade means symmetry and ungerade means unsymmetrical. These are basically for molecular orbitals. When an molecular orbital is rotated along an axis if the phase of orbitals remain as it is then gerade. If phase changes then ungerade. For eg Sigma s bonding is gerade and Sigma s antibonding is ungerade.  wiktionary.org вовка) | |||