31. In molecules, regions of electron density are usually found around the atom, and its bonds. 32. Electron density shields a nucleus from the external field.33. Many non-ionic compounds have chemical bonds that share the electron density that binds them together. 34. In the earliest days, contoured electron density maps were hand drawn on large plastic sheets. 35. They developed a theoretical model of electron densities and the atomic scattering factor in solids. 36. In many cases, disorder smears the electron density map. 37. It mainly depends on the electron density because the atoms in solid electrodes are stationary. 38. If the phases are known, the electron density can be simply obtained by Fourier synthesis. 39. Electron density maps gave evidence that the amino nitrogen occupies a second position near glutamate-270.40. Solving for p _ { f } and substituting into the functional of the electron density :
