(Polar molecules, Non-polar molecules, etc.)
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Hi, so I had had the same question, but I learned that electron arrangement basically means all the electron densities around the atom. In other words, all the stuff around it so that could be the other element(s) and any lone pair of electrons, (this is the steric number.) Once you have this, you look at the VSPER chart (https://goo.gl/images/b1uSPm) I like this one I linked. The molecular shape however is the actual shape of the molecule which could be anything like bent, linear, seesaw, etc.
To add on, the electron arrangement only considers the number of areas of electron density around the central atom. The actual molecule shape factors in the repulsion that results from lone pair electrons which results in shapes with angles other than 90, 120, and 180.
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