One of the best, if not the best, websites I have seen for a long time
Learn about the periodic table through this interactive game.
The game allows you to explore patterns and trends to understand why the Periodic Table is set out in the way it is.
The periodic table was created by Professor Dmitri Mendeleev in 1869 using the properties of known elements. The Periodic Table organises the elements so that elements with similar properties are in the same column ('Group'), with elements across a row ('Period') shown in order of increasing atomic number. So the Periodic Table links the stucture of the atoms of an element with its properties.
Many other interactive periodic tables are available on the web; you can learn more about elements in the Periodic Table in the Visual Elements table from the Royal Society of Chemistry and this photographic one.