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Shifting chemically (Chemical shiff)The great usability of magnetic resonance core is because not every protons in a molecule resonate at the same frequency are identical. Any protons in the molecule surrounded by electrons, thus leading to a slight difference of the electronic environment of one proton with other protons. Proton-proton is protected by electrons surrounding, in the magnetic field, the rotation of the valence electrons from protons to produce a magnetic field against outside magnetic field used the protection depends on the magnitude of the Electron density surrounding it.The greater the density of electrons surrounding the nucleus, then the greater the pula field generated against the outer field that is used (Bo).
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