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ID number:780045
 
Author:
Evaluation:
Published: 07.11.2008.
Language: Latvian
Level: Secondary school
Literature: 7 units
References: Not used
Extract

Ogleklis-14 jeb radioaktīvais ogleklis ir oglekļa radioaktīvais izotops, kas atklāts 1940. gadā. Tā kodolā ir 6 protoni un 8 neitroni. Uz Zemes sastopami 3 oglekļa izotopi: ogleklis-12 (99% no visa atrodamā oglekļa daudzuma), ogleklis-13 (1%) un ogleklis-14 (1 triljonā daļa). Oglekļa-14 pussabrukšanas periods ir 5730 ± 40 gadi. Slāpekļa-14 ietekmē tas sabrūk. Oglekļa-14 atommasa ir 14,003241 amu.
Ogleklis-14 rodas troposfēras augšējā slānī un stratosfērā, kad oglekļa karstos atomus absorbē slāpekļa atomi. …

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