(Polar molecules, Non-polar molecules, etc.)
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The element with higher electronegativity (higher pull for electrons) will have negative sign, and the element with lower electronegativity (less pull for electrons) will have positive sign. It makes sense, because if you want 'negative' more strongly, you will have partially negative sign. For example, in a water molecule, H2O, Oxygen has higher electronegativity, thus has a partial negative charge, whereas Hydrogen has partial positive charge.
The more electronegative atom will have a partial negative charge, and the less electronegative atom will have an equal but partial positive charge. When we draw an arrow to represent this, we draw it from the positive charge pointing to the negative charge (δ+ to δ-).
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