2. Write the symbols of Nitrogen family elements:

3. What is a color of nitrogen N₂ gas?

4. Atomic number of nitrogen:

5. Atomic mass number of nitrogen:

6. What is the physical state of nitrogen N₂ at room condition?

7. Show the electron configuration of N:

8. How many valence electrons are in an atom of nitrogen?

9. What is the oxidation number of a free nitrogen N₂?

10. What type of chemical bond is present in N₂ molecules?

11. How many bonds between N atoms are in N₂?

12. What is the chemical formula of ammonia?

13. Nitrogen is an ..................... element for all living organisms

14. The chemical formula of nitrogen dioxide?

15. What is produced when nitrogen reacts with oxygen gas?

16. Complete the chemical reaction: N₂ + H₂ = …………….

17. Find the oxidation number of nitrogen in a N₂O?