Trends in the Periodic Table

Part One: Atomic Radii

Graph the atomic radii vs atomic number for the first Thirty eight elements.
  1. The atomic number should go on the horizontal axis.
  2. Choose a scale for the graph that uses a majority of the graph paper.
  3. Circle the points that correspond to the peaks on the graph. Write the symbol for each each element at each peak.
  4. Put a square around each point corresponding to the lowest points or troughs on the graph. Write the appropriate symbol for each square.

Part Two: Ionization Energy

Graph the first ionization energy vs atomic number for the first thirty eight elements.
Follow the same four points list above when drawing your graph.

Part Three: Valencies

Graph the most common valencies vs atomic number for the first thirty eight elements.

Special Note: This graph must be a bar graph.
The graph for part 3 is a bar graph, just part 3!

Questions & Analysis

Part One

  1. What is the group name for the elements found at the peaks of your graph? where is this group located on the Periodic Table?
  2. What is the name of the family found at the troughs of your graph? Where is this family located on the Periodic Table?
  3. What is the trend in the size of atomic radii as the atomic number increases within a group?
  4. What is the trend in the atomic radii as the atomic number increases across a period or row? what is the exception to this trend?
  5. Estimate the atomic radius for the element cesium.

Part Two

  1. What group of elements corresponds to the peaks of ionization energy on your graph? Where is this group located on the periodic table? Is it the same group that has the highest atomic radii in Part One?
  2. Which group of elements occupies the troughs on your graph of ionization energy? Suggest a reason for this?
  3. What is the trend in the first ionization energies as the atomic number increases within a group of elements?
  4. What is the trend in the first ionization energies as the atomic number increases across a period or row of elements?
  5. Using your graph, predict a first ionization energy for cesium.

No questions for Part Three

Due date is given in class

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