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  • Compare and contrast the arrangement of elements in Mendeleev's Periodic Table and the Modern Periodic Table.

   Q.10.    Compare and contrast the arrangement of elements in Mendeléev’s Periodic Table and the Modern Periodic Table.

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Mendeleev's periodic table

Modern periodic table

Elements are arranged in the increasing order of their atomic masses

Elements are arranged in the increasing order of their atomic numbers

Consists of 8 groups

Consists of 18 groups

Groups are categorised into subgroups 'a' and 'b'

No subdivision of groups.

Noble gases were not grouped since they were not discovered yet

Noble gases were grouped together at the end of the table.

There was no place for isotopes

Slots for isotopes present according to atomic number
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