Sample Paper -7

PHYSICAL SCIENCE

I. Answer the following questions.

1. Who proposed modern periodic law?

2. Who proposed law of triads?

3. Who proposed law of octaves?

4. Give examples of Dobereiner's triad?

5. How many elements are there in 3 rd period?

6. Which period is incomplete?

7. What is the electronic configuration of inert gases?

8. What are lanthanoids?

9. How many elements are there in 6th period?

10. 5f elements are called as?

II. Answer the following questions.

11. What is modern periodic law? Write its features?

12. State periodic law? Write its features and limitations?

13. How does atomic radius, ionisation energy, electronegativity and metallic character vary in group and in period?

14. Define atomic radius, ionisation energy electron affinity and electronegativity?

15. What is ionisation energy? Explain the factors that affect it?