ChemTable is a freeware Periodic Table application that runs on Palm OS handhelds. Tapping on any of the element panels in the Periodic Table will bring up a form showing a list of physical/chemical properties. You can display either element symbols or atomic numbers in the table. You can also select a subset of the elements for display (Transition Metals, Halogens, Noble Gases, etc). Only half of the Periodic Table can be viewed at a time. To switch sections, tap on the left or right arrow button.
Updated Description:

2.31 (05/05/09) - Minor bug fixes.
2.30 (18/01/09) - Updated the melting point, boiling point, enthalpy of fusion, and electron affinity data. Also made a number of code optimizations.
2.29 (05/10/08) - Using the 5-way navigator to move between the two halves of the periodic table is now much easier. Minor bug fixes.
2.28 (30/08/08) - Added support for 5-way navigation (Palm TX, Treo 600 or higher, and Centro).
2.27 (05/06/08) - Updated the atomic weights to IUPAC 2007 values. Numerous bug fixes and code optimizations.
2.26 (18/01/07) - Updated the mass numbers of radioactive elements to the latest IUPAC values. Added support for 240x240 resolution. Now runs on StyleTap.
2.25 (03/08/06) - Updated the atomic weights to IUPAC 2005 values. The element list can now be sorted by name, symbol, or atomic number.
2.23 (25/07/05) - Added isotope abundances (IUPAC 1997). Revised the electron affinity data. Improved support for grayscale devices.
2.22 (30/07/04) - Added a mode selection popup to the top right corner of the periodic table and element list forms. Renamed Unununium (Element 111) to Roentgenium. Minor bug fixes.
2.21 (17/06/04) - Fixed a bug that caused the program to crash on the Tungsten T3.
2.20 (12/06/04) - Major overhaul of the internals. Added support for color. Note that the minimum requirement is now Palm OS 3.5.
2.18 (20/03/04) - Modified the electron configurations to show orbitals in order of increasing energy. In general, the orbitals are filled in the following order:
1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7pThe program is now compatible with Palm OS 6.
Made minor cosmetic changes.
2.17 (07/02/04) - Added Ununtrium and Ununpentium (Elements 113 and 115). Fixed minor bugs. Now runs more reliably under low memory conditions. Changed the way the application preferences are loaded/saved. If you are installing over a previous version of ChemTable, you may need to set your ChemTable display options again.
2.16 (07/12/03) - Updated the enthalpy values for atomization, vaporization and fusion. Revised some of the crystal structure and thermal conductivity data.
2.15 (22/06/03) - Modified the user interface in the Display Options form. Added a vertical scrollbar to the sorted name list. In the element details form, wrapped text is now indented. Moved "Electron Configuration" close to the top of the element details list.
2.12 (05/06/03) - Added an option to display element names in an alphabetically sorted list. Display preferences are now saved between sessions. Renamed Ununnilium (Element 110) to Darmstadtium.
2.11 (10/11/02) - The Lanthanides are now defined as the 14 elements that follow Lanthanum (Ce to Lu). Similarly, the Actinides are defined as the 14 elements that follow Actinium (Th to Lr). Also made a number of cosmetic changes.
2.10 (24/08/02) - Added 2nd and 3rd ionization energies. Revised the oxidation states for the Noble Gases. Groups are now labelled according to the IUPAC convention. (CAS group labels are still provided in the forms that display element properties.)