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and welcome to video on electronic configurations and doing electron configurations for atoms and ions electronic configurations help us with a variety of things and it really is prerequisite knowledge for several other concepts that well get to there are rules for doing them and Ill start out by essentially doing drawing out with the arrows and all of that so that you understand better the periodic table method and other methods for doing electron configurations now when were writing an electron configuration for an atom the number of electrons equals the number of protons so we look at oxygen for example on the periodic table it has eight protons therefore it will also have eight electrons so Im going to draw eight arrows on this energy diagram that Ive sketched now please understand this is a rough sketch so it is not to scale all right so Im going to draw one to these two arrows represent the first two electrons for oxygen so four oxygens electronic configuration it starts ou