Interesting, but

the end of the wolfram alpha content is sometimes cut in the middle of a sentence (carbon and nitrogen for instance, when reading in French and on iPhone 6). I switched the app to English, its still a little bit cut at times, but readable.
When making paid apps, you should make sure that the main functionalities are working flawlessly.

Tadaaa75 about The Elements by Theodore Gray, v2.0.5