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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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Read the passage and answer the questions :Mendeleev was a Russian chemist, who contributed the most for the development of periodic table of elements wherein the elements were arranged on the basis of their fundamental property, the atomic mass and also on the similarity of chemical properties. Only 63 elements were known at his time. He arranged the 63 elements in the increasing order of their atomic masses and found that there was a periodic recurrence of elements with similar physical and chemical properties. He observed that elements with similar properties fall in the same vertical column. These vertical columns are called groups and horizontal rows of elements are called periods. Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium.Q. Mendeleev’s periodic table has

Read the passage and answer the questions :Mendeleev was a Russian chemist, who contributed the most for the development of periodic table of elements wherein the elements were arranged on the basis of their fundamental property, the atomic mass and also on the similarity of chemical properties. Only 63 elements were known at his time. He arranged the 63 elements in the increasing order of their atomic masses and found that there was a periodic recurrence of elements with similar physical and chemical properties. He observed that elements with similar properties fall in the same vertical column. These vertical columns are called groups and horizontal rows of elements are called periods. Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium.Q. The elements eka aluminium and eka silicon discovered by Mendeleev later found place in the periodic table. Both of these elements belong to

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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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