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period

row in the periodic table: repetition of properties in chemical elements when ordered by atomic number:

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About period

A period on the periodic table is a row of chemical elements. All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor. Arranged this way, elements in the same group (column) have similar chemical and physical properties, reflecting the periodic law. For example, the halogens lie in the second-to-last group and share similar properties, such as high reactivity and the tendency to gain one electron to arrive at a noble-gas electronic configuration. As of 2026, a total of 118 elements have been discovered and confirmed.

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Not who you're looking for? Others named period: 2018 mixtape by City Girls · subdivision of geological time; shorter than an era and long · numbers expressible as integrals of algebraic functions · division in music

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