Praseodimij
59
Pr
Skupina
n/a
Perioda
6
Blok
f
Protoni
Elektroni
Neutroni
59
59
82
Opća svojstva
Atomski broj
59
Relativna atomska masa
140,90765
Maseni broj
141
Kategorija
Lantanoidi
Boja
Srebrna
Radioaktivan
Ne
Od grčke riječi prasios, zelen, i didymos, blizanac
Kristalna struktura
Jednostavna heksagonska
Povijest
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.
Elektrona po ljusci
2, 8, 18, 21, 8, 2
Elektronska konfiguracija
[Xe] 4f3 6s2
Praseodymium is usually stored under a light mineral oil or sealed in glass
Fizikalna svojstva
Agregacijsko stanje
Čvrsto
Gustoća
6,773 g/cm3
Talište
1208,15 K | 935 °C | 1715 °F
Vrelište
3793,15 K | 3520 °C | 6368 °F
Toplina taljenja
6,9 kJ/mol
Toplina isparavanja
330 kJ/mol
Specifični toplinski kapacitet
0,193 J/g·K
Zastupljenost u Zemljinoj kori
0,00086%
Zastupljenost u svemiru
2×10-7%
CAS broj
7440-10-0
PubChem CID broj
23942
Atomska svojstva
Atomski radijus
182 pm
Kovalentni radijus
203 pm
Elektronegativnost
1,13 (Paulingova ljestvica)
Potencijal ionizacije
5,473 eV
Atomski volumen
20,8 cm3/mol
Toplinska vodljivost
0,125 W/cm·K
Stanja oksidacije
2, 3, 4
Primjene
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