3.01 quiz: atomic number and the periodic law ps which of the following characteristics was not included in dmitri mendeleev's periodic table? distribution of elements determined by electron configuration what is the primary atomic characteristic that mendeleev used to organize the periodic table? atomic mass mendeleev left several blank spaces in his original periodic table. what did those spaces represent? elements that had yet to be discovered according to the periodic law, what is the relationship between elements and periods? element properties repeat from period to period. which of these sets of elements has similar properties? consult the periodic table. strontium, magnesium, calcium, beryllium