CrO3, Na4P2O7 and Na6P6O18 are all compounds made up of XO4m-- tetrahedra. Identify the charge on this building block and suggest the type of structural arrangement (monomer, dimer, chains / rings, 2D network or 3D network) for each of the following compounds CrO3, Na4P2O7 and Na6P6O18. Justify your answer.

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