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The stable structures and aromatic characters for three cationic X3+(X=Sc, Y, and La) and three relevant neutral X3Cl (X=Sc, Y, La) clusters are investigated at the DFT and post HF level of theory.The calculated results show that the X3+ cations each has two stable structures: the regular trigon(D3h) and the line(D∞h) with the regular trigon(D3h) being the ground state, while for three neutral X3Cl clusters, Sc3Cl has three stable isomers: the trigon-pyramidal(C3v), bidentate(C2v-1), and C2v-2 structures, Y3Cl and La3Cl each has only two stable isomers: the trigon-pyramidal(C3v) and bidentate(C2v-1) structures.