If you are looking for free Periodic Table for your iPad which provides you the basic information but not too less, Periodic Table for Elements in iTunes is what you should go for. This application displays all the elements of periodic table which can be grouped according to
- Periodic Number
- Periodic Group.
- Radioactive Elements
- Melting and Boiling Points
- and State of the element.
You can click on each of the elements to find more details like Symbol,Orbital Symbols and also displays the Atomic Structure diagram with neutron,electron and protons. For getting a print like description select one element and switch to Details for it.
Being a free app it doesn’t have pictures and more details about but it is enough for you to get a quick recap. You can download this application from itunes from here.