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ID number:346029
 
Author:
Evaluation:
Published: 31.05.2017.
Language: Latvian
Level: Elementary school
Literature: n/a
References: Not used
Extract

Tad sadalīsim šo rindu tādos posmos, kuros elementu īpašības mainās no tipiskām metāliskām īpašībām līdz tipiskām nemetāliskām īpašībām (D. Mendeļejeva laikā cēlgāzes vēl nebija atklātas). Horizontālās elementu rindas, kurās elementu īpašības pakāpeniski mainās (piemēram, rindu, kurā ir astoņi elementi, -no litija Li līdz neonam Ne vai rindu no nātrija Na līdz argonam Ar), D. Mendeļejevs nosauca par periodiem. …

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