Test paper on Periodic classification of the elements (X) CBSE

Periodic classification of the elements.

(CBSE) Class X Test

1. Write electronic configuration of C and Na.  (1)

2. The atom of an electronic configuration 2 8 8 2 belongs to which period? (1)

3. Which is more reactive F or Cl?  (1)

4. Which is bigger in size Cl/Cl^- ? (1)

5. Define the law of Octaves? (2)

6. Why elements of a same group show same valency? (2)

7. Discuss the position of H atom in a periodic table. (2)

8. Differentiate metals and non metals? (2)

9. Define modern periodic law. (2)

10.What are metalloids? Explain with example. (2)