Praseodimiyum
59
Pr
Grup
yok
Periyot
6
Blok
f
Protonlar
Elektronlar
Nötronlar
59
59
82
Temel Özellikleri
Atom numarası
59
Atom ağırlığı
140,90765
Kütle Numarası
141
Kategori
Lantanit
Renk
Gümüşi
Radyoaktif
Hayir
From the Greek word prasios, green, and didymos, twin
Kristal yapısı
Basit altıgen
Tarihi
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.
Enerji seviyesi başına Elektronlar
2, 8, 18, 21, 8, 2
Elektron dizilimi
[Xe] 4f3 6s2
Praseodymium is usually stored under a light mineral oil or sealed in glass
Fiziksel Özellikleri
Faz
Katı
Yoğunluk
6,773 g/cm3
Ergime noktası
1208,15 K | 935 °C | 1715 °F
Kaynama noktası
3793,15 K | 3520 °C | 6368 °F
Ergime ısısı
6,9 kJ/mol
Buharlaşma ısısı
330 kJ/mol
Isı kapasitesi
0,193 J/g·K
Dünya kabuğundaki bulunulabilirliği
0,00086%
Evrendeki bulunulabilirliği
2×10-7%
CAS Numarası
7440-10-0
PubChem CID Numarası
23942
Atom Özellikleri
Atom yarıçapı
182 pm
Kovalent yarıçapı
203 pm
Elektronegatifliği
1,13 (Pauling ölçeği)
İyonlaşma enerjisi
5,473 eV
Atomik Hacim
20,8 cm3/mol
Isıl iletkenlik
0,125 W/cm·K
Yükseltgenme seviyeleri
2, 3, 4
Uygulamalar
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
İzotoplar
Kararlı izotoplar
141PrKararsız izotoplar
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