Praseodim
59
Pr
Skupina
n/p
Perioda
6
Blok
f
Protoni
Elektroni
Nevtroni
59
59
82
Splošne lastnosti
Vrstno število
59
Atomska teža
140,90765
Masno število
141
Kategorija
Lantanoidi
Barva
Srebrna
Radioaktivno
Ne
From the Greek word prasios, green, and didymos, twin
Kristalna struktura
Heksagonalna
Zgodovina
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.
Elektroni po lupinah
2, 8, 18, 21, 8, 2
Razporeditev elektronov
[Xe] 4f3 6s2
Praseodymium is usually stored under a light mineral oil or sealed in glass
Fizikalne lastnosti
Faza snovi
Trdnina
Gostota
6,773 g/cm3
Tališče
1208,15 K | 935 °C | 1715 °F
Vrelišče
3793,15 K | 3520 °C | 6368 °F
Talilna toplota
6,9 kJ/mol
Izparilna toplota
330 kJ/mol
Toplotna kapaciteta
0,193 J/g·K
Zastopanost v Zemljini skorji
0,00086%
Zastopanost v vesolju
2×10-7%
CAS številka
7440-10-0
PubChem CID številka
23942
Atomske lastnosti
Atomski polmer
182 pm
Kovalentni polmer
203 pm
Elektronegativnost
1,13 (Paulingova lestvica)
Ionizacijski potencial
5,473 eV
Atomski volumen
20,8 cm3/mol
Toplotna prevodnost
0,125 W/cm·K
Oksidacijska stanja
2, 3, 4
Uporabe
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
Izotopi
Stabilni izotopi
141PrNestabilni izotopi
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