1)what do the numbers on Mendeleev's periodic tablerepresent?

2) why was Mendeleev's decision to leave blank spaces on histable sometimes was referred to as his most significantcontribution to the periodic table?

3) state the periodic law. How does this law differ fromMendeleev's arrangement of the periodic table?

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Nelly StrackeLv2

22 Feb 2019

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Which of the following statements concerning the periodic table isincorrect?
A. Mendeleev received most of the credit for the early developmentof the periodic table.
B. The elements in a given group or family have similar chemicalproperties.
C. Mendeleev left spaces in his periodic table for undiscoveredelements.
D. All the elements are arranged in order of increasing atomicweight.
E. The chemical characteristics of the elements are periodicfunctions of their atomic numbers.

Mendeleev ordered the elements in his version of the periodic table on the basis of atomic masses instead of their atomic numbers. why?