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Prometijs - Vikipēdija

Prometijs

Vikipēdijas raksts

Nosaukums, simbols, numurs Prometijs, Pm, 61
Atommasa 145 g/mol
Blīvums 7260 kg/m3
Kušanas temperatūra 1315 K (1042°C)
Vārīšanās temperatūra 3273 K (3000°C)

Prometijs ir ķīmiskais elements ar simbolu Pm un atomskaitli 61. Tas ir mīksts, radioaktīvs metāls. Prometijam nav stabilu izotopu. Tas veidojas urāna radioaktīvās sabrukšanas procesā. Prometiju lieto par beta starojuma avotu. Savienojumos prometijs ir trīsvērtīgs.

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