Improved Lewis Structure Dot Diagram
thingiverse
Can you say OCTET? Let's do some chemistry! Took out the center space, it is now a stencil so you can write in element symbols by hand- no more lost circles or extra parts to print! Other improvements include: Straightened out the holes, reduced the height to save plastic, added electron (-) symbols on the markers, made everything the same scale, and added some nice text, "dot diagram", to remind students what they are looking at. Work in progress, but much improved IMHO
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