# 3-D Periodicity Project (85 pts)

In pairs you are going to create a 3-D chart of a periodic property. Your final product will demonstrate how the property you have charted is a function of periodicity. At each stage you and your partner (A and B) will have a task.

# Directions (if you want to use them)

## I. Planning

A. Make the Outline of the PT (on a large sheet of paper – ex. 11” x 17”)

1. It is suggested that you take a sheet of 11” x 17” (23 cm x 43.5 cm) poster board and make a grid of 2 cm x 2 cm squares (suggested in pencil)

2. Outline the periodic table in your grid (H should be about 3 squares from the top and left corner of the paper)

3. Label all of the elements in your periodic table

B. Determine the Scale of the Element Bars

1. You will be given a Periodic Property (boiling point, melting point, density, atomic radius, first ionization potential, electronegativity, thermal conductivity). The values for these properties can be found on the periodic table I gave you.

2. Make a table of the elements (in order of atomic number,) and put the value of the property in a column next to the element (eg. for density H – 0.0899 g/cm3)

3. Scan the list and find your maximum value – this will be your highest bar. We want the highest bar to be 10 cm so divide your maximum value by 10 cm to get the value of your scale (what each cm will be worth) (REMEMBER!). (eg. for density the max is Os – 22.6 g/cm3, divided by 10 cm = 2.26 (g/cm3) / cm)

4. Then use your scale to determine the height of the bar for each element and write it in a third column in table you made in step 2 (with units) (eg. H – 0.0899 g/cm3, divided by divided by 2.26 (g/cm3)/cm gives you a bar height rounded to the nearest tenth of 0.0 cm. Os – 22.6 g/cm3, divided by 2.26 (g/cm3)/cm gives a bar height rounded to 10.0 cm)

 Density (scale = 2.26 (g/cm3) / cm) Element Density (in g/cm3) Bar Height (in cm) H 0.0899 0.0 Os 22.6 10.0

A and B Using the Bar Height for each element, create your 3-D bars.

1. Create strips of paper 2 cm wide. (suggestion – measure one 2 cm strip and then fold paper like an accordion or fan, and then cut along the folds to make several 2 cm strips)

2. Use the strips and the Directions for Making a 3-D Bar for each element.

3. On top of each bar label the with the element symbol and the value of the periodic property (eg. H and 0.0899) (be as artistic or creative as you want with this step)

4. Attach the bars to the table by their feet.