Prazeodimo
59
Pr
Grupo
Neniu
Perio
6
Bloko
f
Protonoj
Elektronoj
Neŭtronoj
59
59
82
Ĝeneralaj Propraĵoj
Atoma Nombro
59
Atommaso
140,90765
Amasa Nombro
141
Kategorio
Lantanoidoj
Koloro
Arĝento
Radioaktiva
Ne
From the Greek word prasios, green, and didymos, twin
Kristala Strukturo
Simpla Sesangula
Historio
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.
Elektronoj per ŝelo
2, 8, 18, 21, 8, 2
Elektrona Agordo
[Xe] 4f3 6s2
Praseodymium is usually stored under a light mineral oil or sealed in glass
Fizikaj Propraĵoj
Fazo
Solido
Denso
6,773 g/cm3
Fandpunkto
1208,15 K | 935 °C | 1715 °F
Bolpunkto
3793,15 K | 3520 °C | 6368 °F
Varmo de Fuzio
6,9 kJ/mol
Varmo de Vaporiĝo
330 kJ/mol
Specifa Varmo Kapacito
0,193 J/g·K
Krusta Abundo
0,00086%
Universa Abundo
2×10-7%
CAS Nombro
7440-10-0
PubChem Kunmetita Identiga Nombro
23942
Atomaj Propraĵoj
Atoma Radiuso
182 pm
Kovalenta Radiuso
203 pm
Elektronegativeco
1,13 (Pauling-skalo)
Potencialo de jonigo
5,473 eV
Atoma Volumo
20,8 cm3/mol
Termika Kondukto
0,125 W/cm·K
Oksidaj Ŝtatoj
2, 3, 4
Aplikoj
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
Izotopoj
Stabilaj Izotopoj
141PrMalstabilaj Isotopoj
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