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[peer-ee-od-ik, peer-] /ˈpɪər iˈɒd ɪk, ˌpɪər-/

noun, Chemistry.
a table illustrating the periodic system, in which the chemical elements, formerly arranged in the order of their atomic weights and now according to their atomic numbers, are shown in related groups.
a table of the elements, arranged in order of increasing atomic number, based on the periodic law. Elements having similar chemical properties and electronic structures appear in vertical columns (groups)

periodic table n.
A tabular arrangement of the elements according to their atomic numbers so that elements with similar chemical properties are in the same column.
Periodic Table

A table in which the chemical elements are arranged in order of increasing atomic number. Elements with similar properties are arranged in the same column (called a group), and elements with the same number of electron shells are arranged in the same row (called a period).


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  • Periodic tenancy

    noun 1. (social welfare) the letting of a dwelling for a repeated short term, as by the week, month, or quarter, with no end date

  • Periodide

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  • Periodization

    [peer-ee-uh-duh-zey-shuh n] /ˌpɪər i ə dəˈzeɪ ʃən/ noun 1. an act or instance of dividing a subject into historical eras for purposes of analysis and study. /ˌpɪərɪədaɪˈzeɪʃən/ noun 1. the act or process of dividing history into periods noun the division and categorization of history into periods of time for the purposes of discussion and […]

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