Build the Periodic Table
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To put an element of the periodic table into the right place, first click a numbered box and then click the element. To remove an element from the table, click it again (hint: colors can be useful).
Contributed by: Enrique Zeleny (March 2011)
Open content licensed under CC BY-NC-SA
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"Build the Periodic Table"
http://demonstrations.wolfram.com/BuildThePeriodicTable/
Wolfram Demonstrations Project
Published: March 7 2011