Periodic Table of Elements

We earlier covered the periodic table application, a useful desktop application for Students of Chemistry.Here is another free java based periodic table application to study the chemical elements.

The periodic table provides a useful reference to the chemical properties of the elements. These properties are determined by an element’s electron configuration. Specifically the number of valence electrons and the effective nuclear charge they experience. A key idea is that the number of valence electrons of an element is indicated by its periodic table group number.

This Periodic Table applet/application is written in Java and can run on Microsoft Windows, Unix/Linux, and Mac OS.The application has been designed as a learning tool to help the beginning high school or undergraduate chemistry student but is not meant as a replacement for a reference such as the CRC Handbook of Chemistry and Physics.

Periodic Table

The application has the following five tab.

  • Table
  • Properties
  • Electron Configuration and
  • Plot

The Table tab displays the periodic table with columns forming groups and rows forming periods. Move your mouse over an element to see its name. Click on an element to select it and view its properties. Use the “Groups” drop down menu to view element families.

The Properties tab lists common chemical and physical properties of the elements. Move your mouse over a property to see its definition. As with all the tabs, use the controls at the bottom of the panel to find a specific element or move forward/back one atomic number or up/down a group.

The Electron Configuration tab displays the ground-state configuration of an element. Notice that the electron shells are arranged by energies. Lower energy shells are closer to the bottom, and higher energy shells are closer to the top. Within a give sub shell all orbitals have the same energy. The order in which atomic orbitals are filled is called the building-up principle. Simply stated, as you increase the atomic number, orbitals are filled by electrons in such a way as to minimize the total energy of an atom. Try using the Previous and Next buttons to explore this important concept.

The Plott ab displays a graph of an element property vs atomic number. Use the “Property” drop down menu to select a property. Note that the elements are colored by s, p, d and f blocks. The currently selected element is colored red. Move your mouse over a bar (color changes to black) to see its name and symbol. Click a bar to select an element. As you plot a property notice the periodic variation in values.

Free download the periodic table application from the following links and enjoy.

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