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I was always under the assumption that if you imagined the atom as a box, you had to have at least one dot on each side before going around and adding more dots. so for something like oxygen with 6 valence electrons, you would put a dot on all 4 sides of the "box" instead of putting 2 dots on 3 sides and calling it a day. so you would have 2 sides with 2 dots and 2 sides with 1 dot each for a total of 6 electrons. I really hope this makes sense I confused myself trying to explain it
There is no order, although you should have one electron on each of the four sides before having two on the same side. You should also take a look at/aim for symmetry (having two on the right side, as well as the left side if the element has six valence electrons).
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