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compare and contract the arrangement of element in mendeleev periodic table and the modern periodic table? plz send the answer
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compare and contract the arrangement of element in mendeleev periodic ...
Mendeleev's periodic table- 
> Elements are arranged in the increasing order of their atomic masses. 
> There are 8 Groups. 
> Each group are subdivided into subgroup '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 separate group is meant for noble gases. 
> This problem has been rectified as slots are determined according to atomic number. 

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compare and contract the arrangement of element in mendeleev periodic ...
Arrangement of Elements in Mendeleev's Periodic Table vs. Modern Periodic Table
Mendeleev's Periodic Table:
- Mendeleev arranged elements in increasing order of atomic mass.
- Left gaps in the table for undiscovered elements.
- Elements with similar properties were placed in the same vertical columns.
- The table had only 8 groups.
Modern Periodic Table:
- Elements are arranged in increasing order of atomic number.
- There are no gaps in the modern periodic table.
- Elements with similar properties are placed in the same vertical columns (groups).
- The modern periodic table has 18 groups and 7 periods.
- The modern periodic table also includes the lanthanides and actinides in separate rows at the bottom of the table.
Overall, while Mendeleev's periodic table was a groundbreaking achievement in the organization of elements, the modern periodic table provides a more accurate and comprehensive arrangement based on the atomic number of elements.
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compare and contract the arrangement of element in mendeleev periodic table and the modern periodic table? plz send the answer
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