WALL360 provides this periodic table of QR codes with open license(under a Creative Commons License for non-commercial use) to support classrooms around the world! Take a look. It can be downloaded from their website here (3.3MB PDF).
From Yiying Lu: Co-Founder + Creative Director at WALLS 360
“A smart kid with a smart phone and our new Periodic Table can learn the fundamentals of chemistry. My design includes 131 embedded QR links to applicable Wikipedia entries, directly connecting the ‘real-world’ version of the Periodic Table to a digital world of additional information – presented in what I hope is a clear, intuitive, and FUN design and interface!”
It’s a great idea to use QR codes in classrooms. The codes resolve to the Wikipedia page for the elements, but with some imagination they could be linked to other open resources like the marvellous videos on chemical elements by Nottingham University http://www.periodicvideos.com/.