Nitrogen

1.  What name is given to the elements in Group 15?

• Halogens

• Pnictogens

• Alkali metals

• Carbon family

2. Write the symbols of Nitrogen family elements:

• N, P, As

• Al, Ga, Ge

• O, Se, S

• F, Cl, Br

3. What is a color of nitrogen N₂ gas?

• white

• reddish brown

• yellow

• colourless

4. Atomic number of nitrogen:

• 7

• 8

• 9

• 14

5. Atomic mass number of nitrogen:

• 7

• 28

• 14

• 21

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

• solid

• liquid

• gaseous

• plasma

7. Show the electron configuration of N:

• 1s2 2s2 2p3

• 1s2 2s2 2p2

• 1s2 2s2

• 1s2 2s2 2p6

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

• 3

• 4

• 5

• 6

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

• -1

• 0

• +1

• +2

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

• ionic

• covalent

• metallic

• hydrogen