| 21. | This is a tetrahedral intermediate analogue with phosphorus replacing the attacked carbon.
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| 22. | The binary tetrahedral group is the covering group of the tetrahedral group.
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| 23. | The binary tetrahedral group is the covering group of the tetrahedral group.
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| 24. | The tetrahedral molecule forms hydrogen-bonded columns in the solid state.
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| 25. | The hexahalides adopt octahedral coordination geometry whereas the tetrahalides are usually tetrahedral.
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| 26. | These groups bound the 3-sphere into identical hyperspherical tetrahedral domains.
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| 27. | The tetrahedral wings were named " Cygnet"
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| 28. | Unlike the oxides, it features tetrahedral Al centers.
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| 29. | One confirming result was that the strongest possible homogeneous truss is cyclically tetrahedral.
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| 30. | The tetrahedral complexes are paramagnetic, whereas the square planar complexes are diamagnetic.
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