CitePeriodic Table
Updated February 28, 2017 | Infoplease Staff![]( "Updated by an Infoplease Editor on February 28, 2017")
| KEY | ELEMENT CLASSIFICATION | ||
 | |||
Non-Metals
Alkali Metals
Alkaline-earth Metals
Rare Earth Elements
Transition Metals
Other Metals
Semimetallics
Halogens
Inert Gases
Radioactive Rare Earth ElementsSee also essay on the periodic table, a chart of the chemical elements, and the science section of the Homework Center.
Source: Gperiodic, copyright © 2003, Frantz, Jonas, and others.
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