The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Edubox Sociedade Annima:
Did you know that most elements in nature share the same origin - the stars?Use this interactive Periodic Table to learn about the physical and chemical properties of all the different elements, compare some of them, and even unveil many curiosities behind their discovery or their applications.