COLEGIO SAN PATRICIOCHEMISTRY 9th

REVIEW – THIRD PERIOD

Name _____________________________________________________ List Number ________

9th _______

I. Answer the following:1. What does the atomic number indicate about an element? __________________

2. What is the atomic number? _____________________________

3. Which are the subatomic particles? What is their charge? ____________________

4. How does an atom become an ion? ______________________________

5. Which elements lose electrons? What type of ions do they form?

______________________________

6. Which elements gain electrons? What type of ions do they form?

______________________________

7. Ionic compounds are formed between ___________________________________

8. Covalent compounds are formed between ________________________________

9. In ionic bonds, atoms transfer ______________, and it is the electrostatic

attraction between ________________ and _______________ ions.

10. In covalent bonds, atoms ___________________ electrons.

11. Covalent bonds can be: ___________________- when electrons are shared

equally, or __________________ - when electrons are shared unequally.

12. What are valence electrons? ___________________________________________

13. How many valence electrons do elements in group 1 have? ____________

14. How many valence electrons do elements in group 2 have? ____________

15. How many valence electrons do elements in group 13 have? ____________

16. How many valence electrons do elements in group 14 have? ____________

17. How many valence electrons do elements in group 15 have? ____________

18. How many valence electrons do elements in group 16 have? ____________

19. How many valence electrons do elements in group 17 have? ____________

20. How many valence electrons do elements in group 18 have? ____________

II. Match the columns, writing the correct letter next to the number, some letters may be used more than once.

1. Elements located at the far right of the periodic table a. atomic number2. Elements located at the far left of the periodic table b. alkali metals3. Mendeleev Periodic Table was arranged by… c. periods4. Modern Periodic Table is arranged by… d. atomic mass 5. The columns of the periodic table are called… e. noble gases6. The rows of the periodic table are called… f. nonmetals7. Subatomic particles involved in chemical bonding g. alkaline earth8. The most reactive metals. They have to be stored in oil h. transition metals9. Nonmetals that react very easily and form salts i. density10. Elements in group 16 (name of family) j. groups11. Elements that do not form compounds, non-reactive k. atomic size12. Good conductors of electricity l. chalcogens13. Poor conductors of electricity m. metals14. Indicates the number of protons and electrons in an atom n. halogens15. Least reactive of all metals o. protons16. Form ions with +3 charge p. neutrons17. Form ions with +1 charge q. electrons18. Elements in group 2 (name of family) r. group 13

s. group 15t. group 16

III. Write if the element has to lose or gain electrons to form an ion, and the symbol of

the ion:

1. Calcium loses 2 electrons Ca 2+ (example)

2. Iodine _____________ ________

3. Aluminum _____________ ________

4. Sulfur _____________ ________

6. Nitrogen _____________ ________

7. Barium _____________ ________

8. Fluorine _____________ ________

9. Bromine _____________ ________

10. Lithium _____________ ________

IV. Write the Lewis Structure (Electron-Dot) for the following elements and compounds:1. Xenon 6. Aluminum

2. Nitrogen 7. Carbon

3. Helium 8. Potassium

4. Magnesium 9. Beryllium

5. Oxygen 10. Nitrogen

11. CCl4 14. AlBr3

12. NaCl 15.CF2H2

13. NH3

V. The following names have mistakes, identify the mistake and correct it.

1. CO2 monocarbon dioxide __________________________________

2. SO2 sulphur dioxygen __________________________________

3. NaCl chloride sodium __________________________________

4. K2S dipotassium sulphide __________________________________

5. PCl3 Potassium trichloride __________________________________

VI. The following formulas have mistakes, identify the mistake and correct it.1. Li2F Lithium fluoride __________________________________2. Al302 Aluminum oxide __________________________________3. ClO6 Dichlorine octoxide __________________________________4. C4Br Carbon tetrabromide __________________________________5. O2F2 Oxygen difluoride __________________________________

VII. Indicate the number of atoms of each element:1. Ba(NO3)2 __________________________________

2. Al2(CrO7)3 __________________________________

3. Al2O3 __________________________________