Interactive periodic table with up-to-date element property data collected from authoritative sources. Look up chemical element names, symbols, atomic masses and other properties, visualize trends, or even test your elements knowledge by playing a periodic table game!

Learn about the latest release of the periodic table, the criteria and guidelines for new element discovery, and the isotopic data and applications. Explore the interactive version, the PDF versions, and the special issues of PAC and CI on the periodic table.

The elements are stacked in such a way that elements with similar chemical properties form vertical columns, called groups, numbered from 1 to 18 (older periodic tables use a system based on roman numerals). Groups 1, 2, and 13–18 are the main group elements, listed as A in older tables.

Award winning periodic table with user-friendly element data and facts. Cool online chemistry videos, dictionary, tools, etc.

An up-to-date periodic table with detailed but easy to understand information.

A standard periodic table. A column of elements down the table is called a group. There are 18 groups in the standard periodic table. Each group has a number: from 1 to 18. Elements in a group have electrons arranged in similar ways, according to the number of valency electrons, which gives them similar chemical properties (they behave in ...

Because certain properties of the elements repeat on a regular basis throughout the table (that is, they are periodic), it became known as the periodic table. Mendeleev had to list some elements out of the order of their atomic masses to group them with other elements that had similar properties.

The organization of the periodic table shows the periodic trends of six different physical properties of the elements: atomic radius, electron affinity, electronegativity, ionization energy, and metallic/nonmetallic character.

Periodic Table and the Elements. Learn about the chemical and physical properties of the elements with these periodic table resources. 10 Interesting Fluorine Facts. 10 Fun and Interesting Phosphorus Facts.