Using
Here are screenshots of in action:
main screen, directly after the start
main screen
You see that using is easy to use and that it is usefull for pupil of all ages and also for students and such as a small and quick database.
If you are too good for this world, you can change the level.

The information dialog
with the training option
with the training option dialog visible
Here is a screenshot of 's information dialog.
In this dialog you get all the information provides. The dialog is divided into three parts: General, States and Energies.
If you click on Web Lookup will get more information from the web (in a new window).

Calculations
In 0.5 we only provide one calculation. This is called KMol. In the field Formula you can enter a totals formula and will get the molecular weight Mw measured in u and the elemental composition. KMol knows all elements of the PSE.

Color schemes
can show you which elements are solid/liquid/vapor at a given temperature.
the State of Matter Dialog
can show you which elements are solid/liquid/vapor at a given temperature.

Timeline
You can active this feature either with the most-right icon in the iconbar or via Settings Show Toolbar. If it is activated you will see a slider below the PSE and an LCD which displays the number 2002. If you move the slider you will notice that some elements disappear if you move it to the right and reappear if you move it to the right. Furthermore the number will change constantly.
The number represents the data you are looking at. If you move the slider to ⪚ 1856 you will only see the elements which where known in the year 1856.
You will notice that some elements are not even shown in the year 2002. This is because some of the elements have not been discovered yet but are predicted to exist.

Numeration
You can change the numeration to IUPAC and CAS or switch it off.

IUPAC
The IUPAC is the International Union of Pure and Applied Chemistry. This is an organization which defines the most standards for chemical concerns.
An A means that that period is a maingroup, a B means it is a Nebengruppe.

CAS
The CAS is the Chemical Abstracts Service. With their numeration the 18 groups have the numbers from 1 to 18. Though the IUPAC numeration is the official, the CAS numeration is what is effectivly used.

Off
If this option is active of course no period-numeration will be in effect.