CLASS - XI CHEMISTRY (Classification of Elements and Periodicity in Properties)
1. How many elements are known at present? [1]
2. Who was the first scientist to classify elements according to their properties? [1]
3. What is the basis of triad formation of elements? [1]
4. Stale the modern ‘Periodic law’? [1]
5. Define and state Mendeleev’s periodic law. [1]
6. How did Mendeleev arrange the elements? [2]
7. Name the two elements whose existence and properties were predicted by Mendeleev though they did not exist then. [2]
8. Describe the main features of Mendeleev’s periodic table? [3]
9. Give the general characteristics of the long form of Modern periodic table? [1]
10. In short give the features of the seven periods. [1]
11. Define electronic configuration. [1]
12. What is the electronic configuration when elements are classified group wise? [1]
13. Give the main features of s-block elements. [2]
14. Give the main features of p-block elements. [2]
15. Give the main features of d-block elements. [2]
16. Give the main features of f-block elements. [2]
