Periodic law
Periodic Pe`ri*od"ic, Periodical Pe`ri*od"ic*al, a. [L. periodicus, Gr. ?: cf. F. p['e]riodique.] 1. Of or pertaining to a period or periods, or to division by periods. [1913 Webster]

The periodicaltimes of all the satellites. --Sir J. Herschel. [1913 Webster]

2. Performed in a period, or regular revolution; proceeding in a series of successive circuits; as, the periodical motion of the planets round the sun. [1913 Webster]

3. Happening, by revolution, at a stated time; returning regularly, after a certain period of time; acting, happening, or appearing, at fixed intervals; recurring; as, periodical epidemics. [1913 Webster]

The periodic return of a plant's flowering. --Henslow. [1913 Webster]

To influence opinion through the periodical press. --Courthope. [1913 Webster]

4. (Rhet.) Of or pertaining to a period; constituting a complete sentence. [1913 Webster]

{Periodic comet} (Astron.), a comet that moves about the sun in an elliptic orbit; a comet that has been seen at two of its approaches to the sun.

{Periodic function} (Math.), a function whose values recur at fixed intervals as the variable uniformly increases. The trigonomertic functions, as sin x, tan x, etc., are periodic functions. Exponential functions are also periodic, having an imaginary period, and the elliptic functions have not only a real but an imaginary period, and are hence called doubly periodic.

{Periodic law} (Chem.), the generalization that the properties of the chemical elements are periodic functions of their atomic wieghts. ``In other words, if the elements are grouped in the order of their atomic weights, it will be found that nearly the same properties recur periodically throughout the entire series.'' The following tabular arrangement of the atomic weights shows the regular recurrence of groups (under I., II., III., IV., etc.), each consisting of members of the same natural family. The gaps in the table indicate the probable existence of unknown elements. [1913 Webster] TABLE OF THE PERIODIC LAW OF THE CHEMICAL ELEMENTS (The vertical columns contain the periodic groups) Series1[ 2[ 3[ 4[ 5[ 6[ 7[ 8[ 9[ 10[ 11[ 12[ -------------------------------------------------------------- |I. II. III. IV. V. VI. VII. VIII. | RH4 RH3 RH3 RH |R2O RO R3O3 RO2 R2O5 RO3 R2O7 RO4 -------------------------------------------------------------- H 1 [1913 Webster] Li 7 [1913 Webster] Na 23 [1913 Webster] K 39 [1913 Webster] (Cu) 63 [1913 Webster] Rb 85.2 [1913 Webster] (Ag) (108) [1913 Webster] Cs 133 [1913 Webster] (-) [1913 Webster] (-) [1913 Webster] (Au) (197) [1913 Webster] (-) [1913 Webster]

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Note: A similar relation had been enunciated in a crude way by Newlands; but the law in its effective form was developed and elaborated by Mendelejeff, whence it is sometimes called {Mendelejeff's law}. Important extensions of it were also made by L. Meyer. By this means Mendelejeff predicted with remarkable accuracy the hypothetical elements ekaboron, ekaluminium, and ekasilicon, afterwards discovered and named respectively scandium, gallium, and germanium. [1913 Webster]

{Periodic star} (Astron.), a variable star whose changes of brightness recur at fixed periods.

{Periodic time of a heavenly body} (Astron.), the time of a complete revolution of the body about the sun, or of a satellite about its primary. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Periodic law — Law Law (l[add]), n. [OE. lawe, laghe, AS. lagu, from the root of E. lie: akin to OS. lag, Icel. l[ o]g, Sw. lag, Dan. lov; cf. L. lex, E. legal. A law is that which is laid, set, or fixed; like statute, fr. L. statuere to make to stand. See… …   The Collaborative International Dictionary of English

  • periodic law — n a law in chemistry: the elements when arranged in the order of their atomic numbers show a periodic variation of atomic structure and of most of their properties called also Mendeleev s law * * * if the elements are arranged in the sequence of… …   Medical dictionary

  • periodic law — n. the principle that the properties of the chemical elements recur periodically when the elements are arranged in increasing order of their atomic numbers …   English World dictionary

  • periodic law — /pear ee od ik, pear /, Chem. 1. the law that the properties of the elements are periodic functions of their atomic numbers. 2. Also called Mendeleev s law. (originally) the statement that the chemical and physical properties of the elements… …   Universalium

  • periodic law — periodinis dėsnis statusas T sritis Standartizacija ir metrologija apibrėžtis Cheminių elementų savybių periodinė priklausomybė nuo jų atomų branduolio krūvio. atitikmenys: angl. periodic law vok. periodisches Gesetz, n rus. периодический закон,… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • periodic law — periodinis dėsnis statusas T sritis chemija apibrėžtis Cheminių elementų savybių periodinė priklausomybė nuo jų atomų branduolio krūvio. atitikmenys: angl. periodic law rus. периодический закон …   Chemijos terminų aiškinamasis žodynas

  • periodic law — periodinis dėsnis statusas T sritis fizika atitikmenys: angl. periodic law vok. periodisches Gesetz, n rus. периодический закон, m pranc. loi périodique, f …   Fizikos terminų žodynas

  • periodic law — noun (chemistry) the principle that chemical properties of the elements are periodic functions of their atomic numbers • Syn: ↑Mendeleev s law • Topics: ↑chemistry, ↑chemical science • Hypernyms: ↑law, ↑ …   Useful english dictionary

  • periodic law — pe′ri•od′ic law′ [[t]ˈpɪər iˈɒd ɪk, ˌpɪər [/t]] n. 1) chem. the law that the properties of the chemical elements are periodic functions of their atomic numbers 2) chem. (formerly) the statement that the chemical and physical properties of the… …   From formal English to slang

  • periodic law — noun Date: 1872 a law in chemistry: the elements when arranged in the order of their atomic numbers show a periodic variation of atomic structure and of most of their properties …   New Collegiate Dictionary

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