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