Periodic table of elements.
The application consists of a main page of the periodic table with the elements classified by colors and basic data, such as name, symbol and atomic number.
By clicking on an element, the detail page opens with the data sorted in 3 levels; advanced basic and extra. All values have been verified in reliable sources, such as the Royal Society of Chemistry, Wikipedia, NIST IUPAC ... etc.

PDF printing of the table is allowed, in A4 or A3 size.
Soon we will include the option to print in PDF the detailed file of an element.
Menu option with the table of most common oxidation numbers, printable in PDF.

Added a learning module. Learn the symbols and names practicing with self-correcting tests, arranged in 3 levels, basic, medium and advanced, configurable to the user's needs. Check your progress.

Any suggestion or correction of errors or misprints is welcome.