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I don’t think ClO2 + would be trigonal pyramidal because it has 3 electron pairs about its central atom, 2 of which are bonded with oxygens and one is a lone pair. This would give it a bent shape. For a molecule to be trigonal pyramidal, I think it would have to have 4 pairs of electrons about the central atom: 3 pairs of which are bonded and one pair that is a lone pair. So I think ClO2 + is bent as well
A trigonal pyramidal shape occurs when an atom has four areas of electron density-- a lone pair of electrons, and three bonds. In the case of ClO2+, it does have four regions of electron density, but it has two lone pairs and two bonds, so it follows a bent structure instead.
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