2. Use the function "Use the Periodic Table to sort and graph" and sort on reaction with 6M HCl for the family of elements in column IIA and in period 3. Find the reactions for each and determine what is special about being in a column with other elements.

3. What elements melt below 0° C?

4. What elements are yellow in color?

5. Which are the five most expensive pure elements? The five least expensive elements?

6. Compare the terrestrial abundances (Earth's crust) of the coinage metals (copper, silver and gold) with those of the alkali metals. Either sketch the graph or give data to support your comparison.

7. Give the years in which the noble gases were discovered.

8. Plot the number of isotopes versus atomic number and discuss any trend observed. You may need to use the enlarge option to discover an important trend. Include the plot or a sketch of the graph in your answer.

9. We use copper for electrical wiring. If Cu somehow became in short supply, what element would make the best substitute? Prove with data from the program.

10. Type can be set by forcing a molten metal into molds for the letters. The metal is then covered with copper. Setting type requires a metal that is solid at 298 K, but that melts at a relatively low temperature (below 700 K). It should have a high density to offer good support for the copper. What element would be the best choice? What would be your second choice? Explain using data.