Question

what are periods and periodicity​

Answer 1

Answer:

Periodicity is the tendency of a function to repeat itself in a regular pattern at established intervals. ... Periodicity is measured by the period of a function, which is the inverse of the frequency of that function, or time per cycle (when referring to trigonometric functions, the period is defined as radians/cycle).

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Answer 2

Answer:

A period in the periodic table is a row of chemical elements. ... Each next element in a period has one more proton and is less metallic than its predecessor. Arranged this way, groups of elements in the same column have similar chemical and physical properties, reflecting the periodic law.