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Compare and contrast the arrangement of elements in Mendeleev’s periodic Table and the Modern Periodic Table.

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Mendeleev’s periodic table Modern periodic table
1 Elements are arranged in the increasing order of their atomic masses. 1 Elements are arranged in the increasing order of their atomic numbers.
2 There are a total of 7 groups (columns) and 6 periods (rows). 2 There are a total of 18 groups (columns) and 7 periods (rows).
3 Elements having similar properties were placed directly under one another. 3 Elements having the same valence shell are present in the same period while elements having the same number of valence electrons are present in the same group.
4 The position of hydrogen could not be explained. 4 Hydrogen is placed above alkali metals.
5 No distinguishing positions for metals and non-metals. 5 Metals are present at the left hand side of the periodic table whereas non-metals are present at the right hand side.

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