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For a triatomic molecule X₂Y, the number of fundamental vibrational frequencies depends on whether the molecule is linear or non-linear. A non-linear triatomic molecule has 3N − 6 = 3 fundamental modes, whereas a linear triatomic molecule has 3N − 5 = 4 normal modes. _________ ___ _______ _______ _____ __________ ________ ________ ______ ______ ___ __________.
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