Much much more useful is hydrogen and it's one dot, like this H So let's ignore Li, Be, and B - they're a bit odd in their rules and we don't need them at all (sorry). You don't have to go in any order, but it looks nice when you try to be somewhat symmetric in your choices. right, left, up, down for the first 4 dots, then again with pairing in the positions. Pretend those positions are orbitals and then fill them in order. Think up, down, left, right for positioning of the electron dots. There is really no wrong way to surround the element - however, there ARE some assumed rules that most everyone follows - so let's just pretend its a real rule (although it's not). Here is the electron dot "formula" for the 2nd row elements.Įasy breezy. You just put the dots symmetrically around the symbol and you've got it. That will be 3 valence electrons all the way up to 8 valence electrons. Now jump over to the p-block and you have groups 13-18. So group 1 and group 2 have 1 and 2 valence electrons. I'll give you a big hint, the number of valence electrons EQUALS the ones-digit of the group number of the periodic table (skipping the d-transition metals). Count those valence electrons - yes, the outermost s and p ones. Put your new found knowledge of electron configurations to work for you. We shall tackle all it.Īs shown in the last section, we find it extremely helpful to actually show the valence shell electrons (the s and p ones) as dots surrounding the element symbol. The better name is Lewis Electron Dot formulas - then the lines come in later.
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