Praseodimium

59
Pr
Kumpulan
Tiada
Kala
6
Blok
f
Proton
Elektron
Neutron
59
59
82
Ciri-Ciri Am
Nombor atom
59
Berat atom
140.90765
Nombor jisim
141
Kategori
Lantanid
Warna
Perak
Radioaktif
Tidak
From the Greek word prasios, green, and didymos, twin
Struktur hablur
Hexagonal Ringkas
Sejarah
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.
Bilangan elektron per petala
2, 8, 18, 21, 8, 2
Konfigurasi elektron
[Xe] 4f3 6s2
Pr
Praseodymium is usually stored under a light mineral oil or sealed in glass
Ciri-Ciri Fizikal
Fasa
Pepejal
Ketumpatan
6.773 g/cm3
Takat lebur
1208.15 K | 935 °C | 1715 °F
Takat didih
3793.15 K | 3520 °C | 6368 °F
Haba pelakuran
6.9 kJ/mol
Haba pengewapan
330 kJ/mol
Muatan haba molar
0.193 J/g·K
Banyak pada kerak bumi
0.00086%
Banyak pada alam semesta
2×10-7%
Ultrapure
Kredit imej: Images-of-elements
Ultrapure praseodymium pieces under argon
Nombor CAS
7440-10-0
PubChem CID Number
23942
Ciri-Ciri Atom
Jejari atom
182 pm
Jejari kovalen
203 pm
Keelektronegatifan
1.13 (Skala Pauling)
Kebolehan mengion
5.473 eV
Isipadu atom
20.8 cm3/mol
Daya pengaliran terma
0.125 W/cm·K
Keadaan pengoksidaan
2, 3, 4
Aplikasi
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.
Praseodymium is considered to be moderately toxic
Isotop
Isotop stabil
141Pr
Isotop tidak stabil
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