1. Who first published the classification of the elements that is the basis of our periodic table today?
   
   
2. By what property did Mendeleev arrange the elements?
   
   
3. By what property did Moseley suggest that the periodic table be arranged?
   
   
4. “The properties of the elements repeat periodically” defines the _____.
   
   
5. What is a period and how many are there in the periodic table?
   
   
6. What is a group (also called a family)? How many are there in the periodic table?
   
   
7. State the number of valence electrons in the following:
   
   

Element Valence Electrons

Magnesium

Phosphorous

Fluorine

Neon

1. Give the names and chemical symbols for the following:
   
   

Atomic Number Element Name Chemical Symbol

13

92

5

25

1. List, by number, both the period and group of each of these elements.
   
   

Element Symbol Period Group

Beryllium Be

Iron Fe

Lead Pb

1. Which of the following pairs of elements belong to the same period? Highlight
   

ANa and Cl b. Na and Li c. Na and Cu d. Na and Ne

1. Which of the following pairs of elements belong to the same group? Highlight
   

AH and He b. Li and Be c. C and Pb d. Ga and Ge

1. What group numbers are the transitions elements?
   
   
2. What are the group 1/IA elements called?
   
   
3. What are the group 2/IIA elements called?
   
   
4. What are the group 17/VIIA elements called?
   
   
5. What are the group 18/VIIIA elements called?
   
   
6. Which alkali metal belongs to the sixth period?
   
   
7. Which halogen belongs to the fourth period?
   
   
8. What element is in the fifth period and the eleventh group?
   
   
9. What is the heaviest noble gas?
   
   
10. What is the heaviest alkaline earth metal?
    
    
11. Would you expect strontium to be, chemically, more similar to calcium or rubidium and WHY?
    
    
12. List the three lightest noble gases.
    
    
13. List all of the alkali metals