Mendeleev classification advantages and disadvantages
Answers
Answer: Advantages of Mendeleev's Periodic table
1. Systematic study of elements: Knowing the properties of one element in a group the properties of other elements could be easily predicted.
2. Prediction of new elements:Mendeleev left gaps in the periodic table for the undiscovered elements and predicted their properties.
3. Correction of wrong atomic weights: it was helpful in correction of wrong atomic weights.
Disadvantages of Mendeleev Periodic table
1. Position of hydrogen: Hydrogen is placed in group-I but its properties resemble with those of halogen also and hense its position is controversial.
2. Position of isotopes: According to this table, isotopes should occupy a different position but all isotopes have been placed in the same block.
3. Position of rare earth metals: All the 14 rare earth metals have been placed together at one place inspite of different atomic weights.
Explanation: