What are the merits of the modern periodic table over Mendeleev’s Periodic table?

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Arrangement of elements on the basis of atomic number

Isotopes of one element are placed with parent element

Separate position for lanthanides and actinides

All of the above

answer is D.

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Detailed Solution

Concept- Elements were organised according to increasing mass number in Mendeleev's Periodic table. The expanded version of Mendeleev's table is the periodic table we use today. The arrangement of elements in the contemporary periodic table is based on their atomic numbers.
And elements showing similar qualities are grouped together. Since it is based on atomic number, isotopes (atoms with the same atomic number and different mass numbers) can be placed with their parent element.
In Mendeleev’s Periodic table only 63 elements were there. Now there are 118 elements. In these actinides and lanthanides have been developed into another class.
Therefore, all the merits mentioned in the options are true.
Hence, the correct answer is option 4.

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