Question

Differentiate between the arrangement of elements in Mendeleev’s periodic table and Modern periodic table.

Answer 1

menelev's periodic table

1) is based on atomic mass
2) table conatin about 66 elements
3) there were gaps for undiscovered elements

modern periodic table

1) is based on atomic number
2) table contains about 112 elements
3) maintains uniformity

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Answer 2

Mendeleev's periodic table is based on the atomic masses of elements whereas the Modern periodic table is based on the atomic number of elements.
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