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...How to video narrative in we will learn use the periodic table help determine number of valence electrons this is a model an atom sodium it has one electron remember are located outer most energy level what group on and lithium notice also do you see relationship between let me all elements have their would idea work for well s take example beryllium four protons be that two so applies but does apply other there way find out magnesium mg yes guess seen move opposite side three five can six pattern here many think seven right eight except helium only i skipped over groups middle part these called transition metals not fit...