The Elements: A Visual Exploration 1.0.1
the author of this app says:
The Elements: A Visual Exploration lets you experience the beauty and fascination of the building blocks of our universe in a way you've never seen before. And as the first really new ebook developed from the ground up for iPad, The Elements beautifully shows off the capabilities of this lovely device.
It is impossile to describe in words the experience of seeing and almost feeling over 500 examples of the chemical elements in virtual form, but to give you an idea of the astonishing depth and beauty of the ebook, you can see a preview of all the individual pages from the ebook. Keep in mind that in the real thing, essentially every one of these objects can be spun around a complete circle with the slightest touch of your finger.
Requires iPhone OS 3.2 or later.