Periodic Table is a handy, free program also available for Mac, that is part of the category Science & education software with subcategory Physics & Chemistry and has been published by Freshney.org.
It's available for users with the operating system Windows 2000 and former versions, and you can download it only in English. Its current version is 3.8.1 and was updated on 11/16/2009.
Since we added this program to our catalog in 2006, it has managed to obtain 300.452 installations, and last week it gained 418 installations.
About the download, Periodic Table is a slick program that takes up less space than the average program in the category Science & education software. It's very heavily used in India, Pakistan, and Philippines.