http://www.bpc.edu/mathscience/chemistry/history_of_the_periodic_table.html
The periodic table is a map of all of the known chemical elements. The map is not based on geographic location, but on size. Looking at the table we can see that there are some elements that are located next to each other have similar properties. We can also learn to read the table to find out which elements will bond together and which ones don't need to bond to anything.
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