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

AcademicChemistryNCERTClass 10

Mendeleev’s Periodic Table
Modern Periodic Table
(i) Elements are arranged in the order of increasing atomic mass.
(i) Elements are arranged in the order of increasing atomic number.
(ii) There are nine vertical columns called groups.
(ii) There are eighteen vertical columns called groups.
(iii) There is no place for noble gases.
(iii) Noble gases are placed on the right-hand side of the table.
(iv) There is no place for isotopes.
(iv) Isotope are kept at the same place because their atomic number is the same.
(v) Transition elements are placed together in group VIII.
(v) Transition elements are placed in the middle of the long period (Group 3 to 12).
 

[Extra information: 

Periodic table: A periodic table is a tabular display of all the chemical elements that are arranged by the order of their atomic number, electronic configuration, and recurring chemical properties. 

It displays the names, atomic numbers, symbols and atomic weights of known elements. It serves as a great tool for solving chemistry problems.

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raja
Updated on 10-Oct-2022 13:19:19

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