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From the structure to the polarity of an entity: Lewis diagram and geometry of molecules Electro-negativity, polarity of a bond and polarity of a molecular entity 00:00: Credits 00:05: What are valence electrons? 01:31: What is the Lewis model of an atom? 03:03: Lewis diagrams of common molecules and ions 07:15: Geometry of chemical entities 09:00: What is electro-negativity? 11:31: Polar bonds & Polar molecules 14:10: Exercise 16:01: See you soon, towards chemistry and beyond...