Cisplatin is a polar molecule (a molecule with unevenly charged sides). This is displayed in the above image with the plus and minus signs at the positive and negative ends of the molecule. The 3 unshared electron pairs on chlorine make that side of the molecule more negatively charged in relation to the side of the molecule with 6 hydrogen atoms (which hold no unshared electron pairs). This causes the molecule to have a negative side and a positive side, making cisplatin a polar molecule.
Figure 1: Cisplatin injection used to treat cancer
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