Final answer:
The statement is false; electron density maps are indeed created from X-ray diffraction patterns, providing detailed information about the structure of crystalline materials.
Step-by-step explanation:
The statement that electron density maps cannot be created from X-ray diffraction patterns is false. Electron density maps are routinely constructed from data obtained through X-ray crystallography, a technique that involves directing X-rays at a crystalline material and measuring the diffraction patterns that result. These patterns give important information about the structure of the material, including the positions of atoms and the electron density distribution within the crystal. This method has been pivotal in the determination of structures of numerous complex molecules, including proteins and DNA.