Question

The major demerit of Mendeleev's periodic table is that the element _______ could not be properly positioned.​

Answer 1

Answer:

increasing atomic mass, the properties where repeated.

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When Mendeleev arranged the elements in order of increasing atomic mass, the properties where repeated. ... In devising his table, Mendeleev did not conform completely to the order of atomic mass. He swapped some elements around. (We now know that the elements in the periodic table are not all in atomic mass order.)

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Answer 2

Answer:

increasing atomic mass, the properties where repeated.