1. The element californium belongs to a family of :

2. The order of increasing sizes of atomic radii among the elements O, S, Se and As is :

3. Increasing order of electro negativity is

4. On the Paulings electro negativity scale the element next to F is

5. Which of the following is not an actinoid?

6. How many elements are there in 6th period of periodic table?

7. Which of the following properties generally decreases along a period?

8. Which of the following oxides is amphoteric in character?

9. Diagonal relationship is shown by

10. The reduction in atomic size with increase in atomic number is a characteristic of elements of-

11. The electron affinity for the inert gases is –

12. Periodic classification of elements is used to examine the

13. The chemistry of lithium is very similar to that of magnesium even though they are placed in different groups. Its reason is:

14. The element with atomic number 35 belongs to

15. The electronic configuration of an element is 1s², 2s² 2p⁶, 3s² 3p³. What is the atomic number of the element which is just below the above element in the periodic table

16. Why the size of an anion is larger than the parent atom?

17. The electronic configuration of halogen is

18. The statement that is not correct for periodic classification of elements is:

19. Arrange S, O and Se in ascending order of electron affinity

20. Correct order of ionization enthalpies is