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ID number:297247
Evaluation:
Published: 10.02.2009.
Language: Latvian
Level: Elementary school
Literature: 3 units
References: Not used
Extract

Atrašanās dabā
Stabilu divatomu molekulu N2 veidā slāpeklis atrodas gaisā (tilpumdaļa 78,09%). Slāpeklis ir visu augu un dzīvnieku olbaltumvielu sastāvdaļa. Tas atrodams akmeņoglēs un kūdrā, to satur arī daži minerāli, no kuriem rūpnieciska nozīme ir Čīles salpetrim NaNO3 un Indijas salpetrim KNO3.

Vēsture
Slāpekli bioloģiskos eksperimentos atklāja D. Rezerfords 1772. gadā. Tai pašāgadā to ieguva arī D. Prīslijs, sadalot amonjaku, un 1773. gadā K. Šēle, pārbaudot gaisa sastāvu. A. L. Lavuazjē šo gāzi, kas neuztur ne degšanu, ne elpošanu, ieteica nosaukt par azotu (gr. azotikos – dzīvību neuzturošs). Latīņu vārds nitrogenium nozīmē salpetri (nitrātus) radošais.

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