What was the primary reason Mendeleev famously left gaps in his periodic table?

To account for measurement errors

To align elements with similar colors

To separate metals from nonmetals

To predict the existence of undiscovered elements

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Dmitri Mendeleev and the Periodic Table

Test your knowledge of Dmitri Mendeleev and his groundbreaking work in developing the Periodic Table of Elements.0 takes

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01Dmitri Mendeleev, the principal creator of the first version of the periodic table, was of what nationality?
02In which year did Dmitri Mendeleev publish his first influential periodic table of elements?
03Mendeleev arranged the elements in his periodic table primarily in order of increasing what property?
04What was the primary reason Mendeleev famously left gaps in his periodic table?
05Which element, discovered in 1875, had properties predicted by Mendeleev, who had called it 'eka-aluminium'?
06Which synthetic chemical element with the atomic number 101 is named in honor of Dmitri Mendeleev?
07Which group of elements was completely unknown at the time of Mendeleev's initial work and thus had no place in his original periodic table?
08Besides Dmitri Mendeleev, which German chemist independently published a very similar periodic table around the same time?
09The modern periodic table is ordered by atomic number, not atomic mass. Which physicist's work in 1913 led to this fundamental reordering?
10To maintain columns with similar chemical properties, Mendeleev placed which element *after* Tellurium, despite it having a slightly lower atomic mass?