Praseodimium
59
Pr
Groep
n/a
Periode
6
Blok
f
Protrone
Elektrone
Neutrone
59
59
82
Algemene Eienskappe
Atoom Nommer
59
Atoommassa
140,90765
Massa Nommer
141
Kategorie
Lantaniede
Kleur
Silver
Radioaktief
Nee
From the Greek word prasios, green, and didymos, twin
Kristalstruktuur
Eenvoudige seshoekige
Geskiendenis
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.
Elektrone per skil
2, 8, 18, 21, 8, 2
Elektronkonfigurasie
[Xe] 4f3 6s2
Praseodymium is usually stored under a light mineral oil or sealed in glass
Fisiese Eienskappe
Fase
Soliede
Digtheid
6,773 g/cm3
Smeltpunt
1208,15 K | 935 °C | 1715 °F
Kookpunt
3793,15 K | 3520 °C | 6368 °F
Heat of Fusion
6,9 kJ/mol
Heat of Vaporization
330 kJ/mol
Spesifieke Hitte Kapasiteit
0,193 J/g·K
Oorvloed in die aardkors
0,00086%
Oorvloed in die heelal
2×10-7%
CAS Nommer
7440-10-0
PubChem CID Nommer
23942
Atomiese Eienskappe
Atoom radius
182 pm
Kovalente Radius
203 pm
Elektronegatiewiteit
1,13 (Pauling scale)
Ionisasie potensiaal
5,473 eV
Atoom volume
20,8 cm3/mol
Termiese geleidingsvermoë
0,125 W/cm·K
Oksidasiestate
2, 3, 4
Toepassings
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
Isotope
Stabiele Isotope
141PrOnstabiele Isotope
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