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MERLOT II


    

Learning Exercise


Material: WebElements
Submitted by: Elizabeth Christophy on Aug 25, 2007
Date Last Modified: Aug 25, 2007
Title: Periodic Table Webquest
Description: An exploration of the periodic table, including the uses, properties and history of elements, and an exploration of atomic radius, ionization energy and ionization energy.
Type of Task: Core Activity, Group, Individual, Student-centered, Supervised, Unsupervised
Time Required 1 hour
Topics: Periodic Table, Properties of elements, atomic radius, ionization energy, electronegativity.
Course: Chemistry
Audience: High School
Categories:
Prerequisites Skills: Ability to navigate around a website. Knowledge of electron configuration. Knowledge of quantum numbers.
Learning Objectives: Become familiar with the properties, history and uses of common elements. Understand periodic trends in radius, ionization energy and electronegativity.
Technical Notes: Need internet access and a web browser.
Text of Learning Exercise: Answer the following questions using the web site http://www.webelements.com 1. Look up all the halogens. Describe what each one looks like under normal conditions. 2. Give three compounds that involve a Noble Gas. 3. Look up elements with the electron configuration ending in p3. Give a biological use for each. 4. Look up elements with the electron configuration ending in s2. Give information about how each is commonly found IN NATURE. (If you were walking down the street and picked some off the ground, in what form would it be? Would you have to be walking in a certain part of the world?) 5. How many grams of calcium are in a person who weighs 125 pounds? 6. Give the name of an element that was named after: (Explain your choices.) a. a place b. a male person c. a female person d. a planet e. a mythological figure f. a physical characteristic 7. a. Sketch the drawing given by webelements for the arrangement of electrons in phosphorous. b. Pick one of the valence electrons in phosphorous, and sketch the shape of the orbital it is in according to www.orbitals.com. Give the quantum numbers for this electron. 8. a. Give the names of 3 elements that have been known since prehistoric times. b. Give the names of 3 NATURALLY-OCCURING elements that were only found in the 20th century and the names of the people who discovered them. c. Give the names of 3 elements that were discovered in the 1800Â’s and the names of the people who discovered them. 9. Using this link: http://www.webelements.com/webelements/properties/text/definitions/atomic-radius.html and the menu on the left side, answer the following questions: a. Define atomic radius. b. Which element on the periodic table has the largest atomic radius? How long is this radius (don't forget the units.) c. What GENERAL PATTERN do you notice for atomic radii down a group (ignore the transition metals)? d. What GENERAL PATTERN do you notice for atomic radii across a period (ignore the transition metals)? 10. Using this link: http://www.webelements.com/webelements/properties/text/definitions/ionization-energy-1.html and the menu on the left side, answer the following questions: a. Define first ionization energy. b. Which element on the periodic table has the largest first ionization energy? c. What GENERAL PATTERN do you notice for first ionization energy down a group(ignore the transition metals)? d. What GENERAL PATTERN do you notice for first ionization energy across a period(ignore the transition metals)? 11. Using this link: http://www.webelements.com/webelements/properties/text/definitions/electroneg-pauling.html and the menu on the left side, answer the following questions: a. Define electronegativity. b. Which element on the periodic table has the largest electronegativity? c. What GENERAL PATTERN do you notice for electronegativity down a group(ignore the transition metals)? d. What GENERAL PATTERN do you notice for electronegativity across a period(ignore the transition metals)?
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