(Polar molecules, Non-polar molecules, etc.)
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Molecular shape determination can be reasoned out by first drawing the Lewis structure and then considering the repulsion of valence electrons and lone pairs. The names of molecular shapes do have to be memorized though.
I think that it's more reasonable to reason the shape rather than memorizing. From seeing its arrangement like tetrahedral, trigonal pyramidal, or trigonal planar, we can see if the molecule has lone pairs and whittle down from there. We would have to know both its arrangement and shape, like if it's bent.
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