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ID number:382234
Author:
Evaluation:
Published: 22.05.2009.
Language: Latvian
Level: Elementary school
Literature: 3 units
References: Not used
Extract

Selēns ir nemetāls ar simbolu Se un atomskaitli 34.
Selēnu atklāja profesors Berceliuss 1817. gadā
Dabā atrodams selenīdu veidā, kā piemaisījums sulfīdu rūdām.
Selēnu iegūst no vara rafinēšanas blakusproduktiem.

Fizikālās īpašības
Cieta viela
Pelēkmelns ar metālisku spīdumu
Atommasa 78,69 g/mol
Blīvums 4390 kg/m3
Kušanas temperatūra 494 K (221°C)
Vārīšanās temperatūra 958 K (685°C)
Indīga viela

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