Worksheet on Chemical Bonding (section 11.2)

Name ________________________________________________________________    Section _____

Fill in the blank with the correct word:

1. A chemical ____________ is an an attractive force that holds atoms together.

2. The overall charge of the nucleus is ______________.

3. Electrons carry a(n) ______________ charge.

4. If the number of protons equals the number of electrons, the overall charge of the atom is ____________.

5. The second energy level can hold as many as ___________ electrons.

6. In a Lewis dot diagram only the __________________ electrons are illustrated.

7. The smallest particle of a covalently-bonded compound is called a(n) ________________.

8. Ionic compounds are made up of ___________________ charged anions and ______________charged cations.

9. In a ________________ bond, atoms share electrons.

10. An atom with a positive or negative charge is called a(n) _________________ .

True/False :

11. Chemical bonding is the process of atoms combining to form new compounds.                 T    F

12. For elements 1-20, the third energy level can hold as many as 18 electrons.                      T    F

13. Valence electrons are important in determining how atoms bond with each other              T    F

14. Sodium chloride is a covalently-bonded compound.                                                         T    F

15. The shape of molecules affects their properties.                                                              T    F

16. When atoms combine, they become less stable                                                                 T    F

Bohr Models and Lewis dot diagrams

Draw the Bohr models and Lewis dot diagrams for 

17.lithium

18.oxygen

19.boron

20.silicon

Analyze the following formulas:

Indicate whether the following compounds are ionic or covalent:

25.NaCl                                                                                                    I            C

26.LiOH                                                                                                    I            C

27.CO                                                                                                       I            C

28.water                                                                                                   I            C

29.ammonia (made up of 1 atom of nitrogen + 3 atoms of hydrogen                I            C

30.methane (made up of 1 atom of carbon and 4 atoms of hydrogen)              I             C

State the Octet Rule. Explain what happens to electrons when potassium combines with fluorine. Is the compound formed ionic or covalent. Draw Lewis dot diagrams to show the process.