Periodic Classification of Elements class 10th

Short type question and answer for class 10th CBSE 

1. What was the major limitation of Mendeleev’s periodic table? 

2. Name three elements whose atomic masses were corrected on the basis of their position in Mendeleev’s periodic table.

3. Elements of group III A and V A in the Mendeleev’s periodic table have the same general formula of their hydride (RH3 ) How are they placed in different groups in Mendeleev’s periodic table? 

4. Why did Mendeleev leave some gaps in his periodic table? 

5. In group VIII of the periodic table, why does cobalt with atomic mass 58.93 appear before nickel having atomic mass 58.71? 

. (a) If we take beryllium as the first element then which will be the eighth element from it according to Newland's law of octaves ? 

(b) Did Mendeleev include noble gases in his periodic table? 

6. (a) What physical and chemical properties ofelements were used by Mendeleev in creating his periodic table? (b) What were the two major shortcoming of Mendeleev’s periodic table? 

7. (21) Why could no fixed position be given to hydrogen in Mendeleev’s periodic table? 

(b) State two achievements of Mendeleev’s periodic table.