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ID number:467981
 
Author:
Evaluation:
Published: 26.09.2009.
Language: Latvian
Level: Secondary school
Literature: n/a
References: Not used
Extract

Vēsturiskais Apskats
1789.g. Antuāns Lavuazjē sadala ķīmiskos elementus četrās grupās.
1817.g. Johans Debereiners izveido ķīmisko elementu triādes.
1865.g. Džons Ņūlends izveido Oktāvu tabulu.
19.gs. 60. gados Dmitrijs Mandeļējevs izveido savu tabulu.
1870.g. Iznāk otrā Mandeļējeva tabula.
1914.g. H.Mozlijs pierāda, ka ķīmisko elementu periodiskuma pamatā ir atomnumurs.
Periodiskās sistēmas likumsakarības
Kārtas skaitlis
kodolu lodziņš
protonu skaits kodolā
kopējais elektronu skaits atomu enerģijas līmeņos.…

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