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Compare and contrast the arrangement of ...

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
Elements are arranged in the increasing order of their atomic masses.
There are 8 groups.
Groups for noble gas was not present as noble gases were not discovered by that time.
There was no place for isotopes.
Modern periodic table
Elements are arranged in the increasing order of their atomic number.
There are 18 groups.
Groups are not subdivided into sub-groups.
A separate group is meant for noble gases.
This problem has been clarified as slots are determined according to atomic number.
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