compare and contrast the arrangement of elements in Mendeleev periodic table and 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.
> Each groups are subdivided into sub group 'a' and 'b'
> 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 numbers.
> There are 18 Groups.
> Groups are not subdivided into sub-groups.
> A seprate group is meant for noble gases.
> This problem has been rectified as slots are determined according to atomic number.
> Elements are arranged in the increasing order of their atomic masses.
> There are 8 Groups.
> Each groups are subdivided into sub group 'a' and 'b'
> 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 numbers.
> There are 18 Groups.
> Groups are not subdivided into sub-groups.
> A seprate group is meant for noble gases.
> This problem has been rectified as slots are determined according to atomic number.
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Answered by
114
in mendeleef periodic table , elements are arranged in increasing order of atomic weights and he stated that properties of elements were periodic functions of their atomic wts and also method could not be justify position of certain elements, rare earths and isotopes.
In Modern periodic table, method removes most of the defects of Mendeleef's Periodic Table.
In Modern periodic table, method removes most of the defects of Mendeleef's Periodic Table.
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