Extended E.C. - Trends in the Periodic Table

INTRODUCTION

In class, we learned that the periodic table is organized according to properties.  Through our activities, we have already deduced several of the trends in the periodic table.   For example: metals are on the left while nonmetals are on the right with metalloids on the staircase; the column numbers refer to the number of valence electrons; column numbers can also indicate what ions elements will form.  We see that families (groups) have similar properties, and periods repeat in a regular pattern.  We are even learning that chemical reactivity can be predicted using periodic table location.  Based on this information, we know where the most and the least reactive elements are. 

There are still many more layers of understanding available from our current periodic table.  Remember, organization helps us understand, predict, find new patterns, and ask questions.

Four of the other well-known periodic trends are:

  • Electronegativity
  • Atomic radius
  • Electron affinity
  • Ionization energy

 

For this optional assignment, you will do overview research of all four of these trends.  You will then choose one of the trends and do a more in-depth analysis.  Your final product will be an original representation that explains the trend as it relates to what we have been learning in class recently.  QUALITY will be a factor in how many point are earned for this project.

 

ASSIGNMENT

PART 1:

  1. Define each of the four terms above (electronegativity, atomic radius, electron affinity, ionization energy). 
  2. Identify the units of measurement used for the property and cite a specific example of each.
  3. Describe the periodic trend that occurs for each of the terms.  (e.g. This might sound something like “As you go from left to right across a period…”)
  4. Construct a visual representation of the trends or find an existing visual representation.  This can be done individually (one image for each of the four trends) or all four trends may be included on the same image.  If you use an existing representation, you must cite your source.

 

NOTE:  Part 1 may be done in a chart form or in narrative form.  While this information is well known and many sources will have the same answer, direct plagiarism (e.g. cutting and pasting, using other work in its entirety) will not earn credit.

ALTERNATE:  Completing this webquest can be a substitution for Part 1 if you wish. However, partially completed webquests will not be acceptable.  You must answer all questions.    http://www.wsfcs.k12.nc.us/cms/lib/nc01001395/centricity/domain/577/periodic_trends_webquest_1_.pdf

 

 

PART 2:

  1. Choose one of the four properties.  Do further research on this property.  You must use and identify at least 3 different sources you used while doing this research.  Sources can be websites, text resources, videos, etc. (“GOOGLE” is NOT a website!!)  Cite your references to earn these points.
  2. Now, select at least one period (row).  Construct or locate at least 6 Bohr models for this period.  Visually arrange the Bohr models in a way that represents their placement on the periodic table.  On the same page, write an explanation IN YOUR OWN WORDS about why the trend occurs.  Refer to the Bohr diagrams to support your explanation.  For example, if the trait that you investigated increases from left to right across the table, what exactly is the cause of the increase (and what causes the pattern to reset)?  [You know how we have our understanding of  WHY elements for ions?  That is the level of depth for the WHY I am talking about.] 
  3. Select at least one family (column).  Repeat the above directions.  [Construct or locate at least 6 Bohr models for this family.  Visually arrange the Bohr models in a way that represents their placement on the periodic table.  On the same page, write an explanation IN YOUR OWN WORDS about why the trend occurs.  Refer to the Bohr diagrams to support your explanation. ]

 

 

DUE DATE

This is due MONDAY, MAY 22, 2017.

 

 

CHECK LIST

USE THIS CHECK LIST TO HELP ENSURE YOU HAVE COMPLETED ALL REQUIRED TASKS

           

PART 1

         

 

Definition

Units

Example

Trend statement

Trend image/diagram

Electronegativity

 

 

 

 

 

Atomic Radius

 

 

 

 

 

Electron affinity

 

 

 

 

 

Ionization energy

 

 

 

 

 

           

PART 2

         
 

Resource 1

Resource 2

Resource 3

Additional?

 

Research cited

 

 

 

 

 
           

Period Assessment

6 Bohr models in sequence from a  period

models are correct

arranged in order on paper

created or accurately cited

 

Visual

 

 

 

 

 

Explanation accurate and complete and refers to Bohr models

 

 

           

Family Assessment

6 Bohr models in sequence from a family

models are correct

arranged in order on paper

created or accurately cited

 

Visual

 

 

 

 

 

Explanation accurate and complete and refers to Bohr models

 

 

           

Other notes: