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periodic table

Table systematically placing elements based on atomic number and recurrent properties

Also known as Mendeleev's periodic table · periodic table of chemical elements · periodic table of elements · the periodic table · periodic classification of elements

Instance of: chemical classification
Subclass of: table
Part of: extended periodic table
Founded: March 6, 1869

Overview

From Wikipedia, the free encyclopedia · Read full article · Text CC BY-SA 4.0

The periodic table, also known as the periodic table of the elements, is an ordered arrangement of the chemical elements into rows ("periods") and columns ("groups"). Elements in the same group tend to show similar chemical characteristics. The table is also divided into four roughly rectangular areas called blocks. The periodic table is an icon of chemistry, although it is also widely used in physics and other sciences. It is a depiction of the periodic law, which states that when the elements are arranged in order of their atomic numbers an approximate recurrence of their properties is evident.

Overview

All data

95 statements · 12% with external sources · numbers in brackets are citations

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60 identifiers linking periodic table across the web's reference databases

Data quality

statements

12%

externally sourced

Source last edited October 30, 2026. AIDb refreshes this page daily.

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AIDb. (2026). periodic table (Q10693). Retrieved from https://aidb.si/e/periodic-table-Q10693