3. Elements
   
   1. Use the periodic table on the inside back cover to write the names for the elements that have the following symbols:
      a) O
      b) S
      c) Cu
      d) Ag
      
   2. Use the periodic table to write the symbols for the following elements:
      a) iron
      b) nirtogen
      c) calcium
      d) mercury
      
   3. a) Which elements are most likely to undergo the same kinds of reactions, those in a group or those in a period?
      b) Explain
      
   4. Describe the main differences between metals, nonmetals, and metalloids.
      
   5. a) What is the significance of the vertical columns of the periodic table?
      b) What is the significance of thehorizontal rows.
      
   6. a) Compare the physical properties of metals, nonmetals, metalloids, and noble gases.
      b) Describe where in the periodic table each of these kinds of elements is located.
      
   7. Suppose element X is a poor conductor of electricity and breaks when hit with a hammer. Element Z is a good conductor of electricity and heat. In what are of the periodic table does each element most likely belong?
      
   8. a) Use the periodic table to write the names of the elements that have the following symbols
      b) Identify each of the elements as a metal, nonmetal, metalloid, or noble gas.
      
      1. K
      2. Ag
      3. Si
      4. Na
      5. Hg
      6. He
      
   9. An unknown element is shiny and is found to be a good conductor of electricity. what other proerpties would you predict for it?
      
   10. a) Use the periodic table to identify the group number for each of the following;
       b) Use the periodic table to identify the period numbers for each of the following
       
       1. carbon, C
       2. argon, Ar
       3. chromium, Cr
       4. barium, Ba

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