The Periodic Table: Tutorial 9 of 32
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In this activity, you will learn to organize the periodic table using the chemical database tool.
Imagine that you're a chemistry professor in the 1860s. Like Newlands and Mendeleev, you're intrigued by repeated patterns of chemical behavior
in the lighter known elements, recorded in the table below. Your job is to identify "families of elements that behave similarly and then publish
your results in this activity. You have two advantages over Newlands and Mendeleev
• Much of the data is already filled out in your table, including atomic ratios for the most common compounds of oxygen and chlorine,
• You have access to the Internet and computer-based tools to fill in the rest.
LAN
Part A
Your task is to fill in the empty cells shaded in green in the table. You'll record the atomic ratios between the selected element and its chlorine
compound (x:Cl) and its oxygen compound (X:0). Once you have filled in those cells, you'll look for elements that seem to be similar and give them
a unique "family number in the last column
You'll use the chemical Database tool, which contains information about all the elements and thousands of common compounds.
Let's use the first element, beryllium, in the table below as an example:
1. In the tool, click on Be (beryllium) near the top left corner of the periodic table. The compound list below the table is now filtered to include
only those compounds containing beryllium. The alphabetized list includes both formulas and common names of compounds. It may take
some time to figure out how the alphabetization works with numbers and parentheses. First there is Be, then compounds with Be followed
by a number or an item in parentheses, and then finally Be followed by other letters, Slich as BeBr2.
2. Find Bec12. In your table, enter the atomic ratio for x:Clas: 1:2. Note that you could now look up a lot of information about this compound
including common reactions, its Wikipedia page, and its National institute of Standards and Technology (NIST) Information page:
3. Next, find the compound that combines Be and O. Enter its atomic ratio in the next column of the table X:0). Follow this process for all the
remaining blank ratlos in the table. There's one compound for each of these element combinations. (Warning! Some of these compounds
may be tricky to track down. Common names will be mixed in with formulas in the alphabetical list. For silicon, solarne will appear before
Silicon's compound formula with oxygen. Don't let that throw you off.)
4. Finally, assign a family number to elements that seem to be closely related chemically
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