Praseodymium
59
Pr
Gruppe
n/a
Periode
6
Blok
f
Protoner
Elektroner
Neutroner
59
59
82
Generelle Egenskaber
Atomnummer
59
Atommasse
140,90765
Masseantal
141
Kategori
Lantanider
Farve
Sølv
Radioaktiv
Nej
From the Greek word prasios, green, and didymos, twin
Krystalstruktur
Simpel Hexagonal
Historie
Praseodymium was first identified in 1885, in Vienna, by the Austrian chemist Carl Auer von Welsbach.
It was discovered in didymium, a substance incorrectly said by Carl Gustav Mosander to be a new element in 1841.
Pure metallic praseodymium was first produced in 1931.
It was discovered in didymium, a substance incorrectly said by Carl Gustav Mosander to be a new element in 1841.
Pure metallic praseodymium was first produced in 1931.
Elektroner i hver skal
2, 8, 18, 21, 8, 2
Elektronkonfiguration
[Xe] 4f3 6s2
Praseodymium is usually stored under a light mineral oil or sealed in glass
Fysiske Egenskaber
Tilstandsform
Fast stof
Massefylde
6,773 g/cm3
Smeltepunkt
1208,15 K | 935 °C | 1715 °F
Kogepunkt
3793,15 K | 3520 °C | 6368 °F
Smeltevarme
6,9 kJ/mol
Fordampningsvarme
330 kJ/mol
Varmefylde
0,193 J/g·K
Forekomst i jordskorpen
0,00086%
Forekomst i universet
2×10-7%
CAS-nummer
7440-10-0
PubChem CID-nummer
23942
Atomare egenskaber
Atomradius
182 pm
Kovalent radius
203 pm
Elektronegativitet
1,13 (Paulings skala)
Ioniseringspotentiale
5,473 eV
Atomvolumen
20,8 cm3/mol
Varmeledningsevne
0,125 W/cm·K
Oxidationstrin
2, 3, 4
Anvendelser
Praseodymium is used as an alloying agent with magnesium to create high-strength metals that are used in aircraft engines.
Misch metal, used in making cigarette lighters, contains about 5% praseodymium metal.
Praseodymium is used to make specialized yellow glass goggles for glass blowers and welders.
Misch metal, used in making cigarette lighters, contains about 5% praseodymium metal.
Praseodymium is used to make specialized yellow glass goggles for glass blowers and welders.
Praseodymium is considered to be moderately toxic
Isotoper
Stabile isotoper
141PrUstabile isotoper
121Pr, 122Pr, 123Pr, 124Pr, 125Pr, 126Pr, 127Pr, 128Pr, 129Pr, 130Pr, 131Pr, 132Pr, 133Pr, 134Pr, 135Pr, 136Pr, 137Pr, 138Pr, 139Pr, 140Pr, 142Pr, 143Pr, 144Pr, 145Pr, 146Pr, 147Pr, 148Pr, 149Pr, 150Pr, 151Pr, 152Pr, 153Pr, 154Pr, 155Pr, 156Pr, 157Pr, 158Pr, 159Pr