A very nice site with all sorts of information on helium, including good summaries on isolation and uses of helium.

Explains how Dmitri Mendeleev created the periodic table of elements, how it was organized, the changes made by Henry Moseley in 1931, some characteristics of element groups, and what the atomic mass, number, and abbreviation each...

Provides an explanation of the periodic table of elements and how to read it.

In this interactive periodic table from the NOVA Web site, find out the role of various elements in making fireworks.

Learn about the classification of matter based on whether the chemical composition is pure or a mixture. Understand the definitions of elements, compounds, substances, and mixtures, and what the differences are between them. Five types...

An interactive periodic table. When you hover over an element, its name, atomic number, group, period, and electron affinity value appear.

A chemistry tutorial highlighting historical development of the atomic theory of matter and the periodic table of elements.

Quiz yourself over the table of elements! The computer will give you an element and, depending on the selections you make below, you will have to supply the element's chemical name, chemical symbol or atomic number. Enter your answer...

This site may focus on fun, rather than facts, but it will become a favorite of any Chemistry student. Here you will find scanned images of panels and/or pages of comic books, with references to the element you seek.

Elements in the same group in the periodic table have similar chemical properties. This is because their atoms have the same number of electrons in the highest occupied energy level. Group 1 elements are reactive metals called the alkali...

This lesson focuses on the periodic table and the configurations. In the modern periodic table, elements are in order of atomic number in periods and groups. Electronic configurations model how electrons are arranged in atoms. A link to...

Provides information on the development of the periodic table under the following sections: In the Beginning, Law of Triads, First Attempts At Designing a Periodic Table, Law of Octaves, Who Is the Father of the Periodic Table?,...

This App provides students with a graphical representation of the elements of the Periodic Table. Information includes 15 properties and facts about the 109 known elements. Students get to explore graphs of the periodic nature of the...

The number of protons in the atom of an element determines its place in the Periodic Table. The number of electrons in an atom is the same as the number of protons. These electrons are arranged in shells or 'energy levels' around the...

This lesson focuses on atoms and elements including what they are, the chemical symbols for elements, and the placement of elements on the periodic table. A link to a test is provided.

The elements in Group 7 of the Periodic Table are called the halogens. They include chlorine, bromine and iodine. Learn about their properties and uses, then take a quiz.

A giant sized table made of wood houses a large collection of minerals from the periodic table. Click on any wooden tile to discover what the element looks like and details about its atomic structure and uses. The author even tells you...

Explains different sections of the periodic table, and how they are used.

An illustrated how-to for understanding how to read and extract information from the periodic table.

An overview of the differences between the metal and non metal groups. Includes a lot of information on the periodic table and has a plethora of graphs.

Explains what electronegativity bonding is and presents a periodic table of elements that is color-coded to show electronegativity trends.

This subtable lists and describes the six alkali metals of the periodic table of Elements. Related links are provided.

Full of information on each individual element. Just click on the one you are researching and you will get all of the information you need from the general information all the way to cost of the element. Also contains video clips.

By clicking on individuals elements, users can explore a broad range of information about the element, their reactions, their properties, their structures, and their histories.