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Lithium - Wikipedia

Lithium

Fra Wikipedia, den frie encyklopædi

3 HeliumLithiumBeryllium
H

Li

Na

Det periodiske system
Udseende

Sølvagtigt, hvidt/gråt
Generelt
Kemisk symbol: Li
Atomnummer: 3
Atommasse: 6,941 g/mol
Grundstofserie: Alkalimetal
Gruppe: 1
Periode: 2
Blok: s
Elektronkonfiguration: 1s2 2s1
Elektroner i hver skal: 2, 1
Atomradius: 145 pm
Kovalent radius: 134 pm
Van der Waals radius: 182 pm
Kemiske egenskaber
Oxidationstrin: 1
Elektronegativitet: 0.98 (Paulings skala)
Fysiske egenskaber
Tilstandsform: Fast stof
Krystalstruktur: Kubisk, I-centreret
Massefylde: 0,534 g/cm3
Massefylde på væskeform: 0,512 g/cm3
Smeltepunkt: 180.54 °C
Kogepunkt: 1342 °C
Kritisk punkt: (Ekstrapoleret)
2949°C, 67 MPa
Smeltevarme: 3,00 kJ/mol
Fordampningsvarme: 147,1 kJ/mol
Varmefylde: 24,860 J·mol–1K–1
Varmeledningsevne: 84.8 W·m–1K–1
Varmeudvidelseskoeff.: 46
Magnetiske egenskaber: Ikke magnetisk
Mekaniske egenskaber
Youngs modul: 4,9 GPa
Forskydningsmodul: 4,2 GPa
Kompressibilitetsmodul: 11 GPa
Hårdhed (Mohs' skala): 0,6

Lithium (forkortes Li) er et grundstof med atomnummer 3 i det periodiske system.

Lithium blev opdaget af Johann Arfvedson i 1817.

Lithium salte har vist sig at have en gavnlig effekt til at stabilisere patienter der er maniodepressive.

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