I suppose you have already studied the periodic table at school. It is a table where all elements known to man are arranged according to their atomic number and used as a quick look-up table for information such as atomic weight, whether it is a metal or non-metal or alkali and so on. That's the type of information you get from a periodic table on paper.
Now, there is a software called the Periodic Table Explorer that is a lot more than just a standard periodic table. In fact, it's your new chemistry teacher. Say hello! Periodic Table Explorer gives you a detailed information on each element and is a perfect reference guide for students, teachers and anybody who want to learn about elements.
The program's main window contains a big toolbar with some icons that take you to separate sections that open in a small window inside the program. You can open all the windows at once and any number of them and easily switch between the windows, so that all information are readily visible.
The actual periodic table is only a part of this program and is available by clicking the first icon. Hovering the mouse on top of an element on the table displays such information like atomic weight, melting point, boiling point along with a small image of the element. Now that's really cool. You never saw all the elements, did you? On the top is a horizontal bar that displays the absorption spectrum of the element.
Clicking on the element will open another window with detailed information about the element. Now it's easy to get lost here. There is so much information: properties, details of isotopes, important compounds, details of reactions with water, air, halogens and acids, occurrences in the universe, graphs and even short biographies of the scientists who discovered them.
Another window will display the atomic structure with little animation of electrons revolving around the nucleus. Then there are atomic width diagrams and crystal structure diagrams, electron configuration table and so on.
The toolbox gives you access to over 330 constants and over 6400 equations and chemical formulae. The glossary has definition to almost every freaking term in chemistry. There is also a Note to jot down important data and notes, but I guess you rather use a separate Word or text file or that.
The search is very advanced, in the sense that you can search elements by specifying any parameters and within specific values.
The most amazing thing is the amount of information they have stuffed into this program. This is not your chemistry teacher. This is your whole chemistry library! I'm totally impressed.