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First draw the direction of the dipole. The dipole should point towards the more electronegative atom in a molecule. therefore the end that the dipole points at is delta negative, and the end where the dipole starts at is delta positive. It may be confusing but try drawing it out, it'll help.
Usually the anions found on the right side of the periodic table have a delta negative sign - this is because they are usually an electron acceptor. The cations found on the left side of the periodic table have delta positive sign - this is because they are usually electron donors.
Delta positives usually give electrons. Delta positives are typically central atoms such as in AlCl3. Al has 3 electrons to give so it bonds with 3 Cl atoms. If you visualize the electron pull it goes towards the delta negative which in this case are the Cl atoms. Electron pull goes towards the delta negative from the delta positive. Also in dipole moments you want to assure delta positives attract delta negative since a positive and positive or vice versa will repel against one another.
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