Periodic Table of Elements
Main Concept
The Periodic Table of Elements is an arrangement of the chemical elements in a tabular form (18 columns by 7 rows), where elements are organized by their atomic number, electron configuration and chemical properties. The rows in the table are called periods, and the columns are called groups (some groups have special names, such as halogens and noble gases). Elements with atomic numbers 1 (hydrogen) through 98 (californium) have been found to exist naturally. However, elements with atomic numbers greater than 98 have only been synthesized in laboratories. From left to right, top to bottom, the atomic numbers of the elements in the table increase.
Select an element in the periodic table to see the element name, atomic number, atomic mass, melting point, boiling point and atomic radius. Click on a category name to see which elements belong to that category.
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