1.

Differentiate between the arrangement of elements in Mendeleev's periodic table and Modern periodic table

Answer»
S.noMendeleev’s periodic table                                     Modern periodic table.                                                                                                      
1The elements were arranged according to  increasing atomic masses.                   The elements were arranged according to increasing atomic masses.                                    
2Position of isotopes was not justified.                          There was no problem in the placing of isotopes.                                                                
3Position of hydrogen was not justified because it resembles both with alkali metals and halogens.                  Hydrogen has been given a unique position due to its resemblance with alkalis and halogens.           


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