Praseodym
59
Pr
Gruppe
I/T
Periode
6
Blokk
f
Protoner
Elektroner
Nøytroner
59
59
82
Generelle egenskaper
Atomnummer
59
Atomvekt
140,90765
Massetall
141
Kategori
Lantanoider
Farge
Sølv
Radioaktiv
Nei
From the Greek word prasios, green, and didymos, twin
Krystallstruktur
Simple 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 per energinivå
2, 8, 18, 21, 8, 2
Elektronkonfigurasjon
[Xe] 4f3 6s2
Praseodymium is usually stored under a light mineral oil or sealed in glass
Fysikalske egenskaper
Fase
Fast stoff
Tetthet
6,773 g/cm3
Smeltepunkt
1208,15 K | 935 °C | 1715 °F
Kokepunkt
3793,15 K | 3520 °C | 6368 °F
Smeltevarme
6,9 kJ/mol
Fordampningsvarme
330 kJ/mol
Spesifikk varmekapasitet
0,193 J/g·K
Forekomst i jordskorpa
0,00086%
Forekomst i universet
2×10-7%
CAS Number
7440-10-0
PubChem CID Number
23942
Atomegenskaper
Atomradius
182 pm
Kovalent radius
203 pm
Elektronegativitet
1,13 (Pauling-skalaen)
Ioniseringsenergi
5,473 eV
Molart volum
20,8 cm3/mol
Termisk ledningsevne
0,125 W/cm·K
Oksidasjonstilstander
2, 3, 4
Bruksområder
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