Praseodimium

59
Pr
Golongan
n/a
Periode
6
Blok
f
Proton
Elektron
Neutron
59
59
82
Sifat Umum
Nomor atom
59
Massa atom
140,90765
Nomor massa
141
Kategori
Lantanida
Warna
Perak
Radioaktif
Tidak
From the Greek word prasios, green, and didymos, twin
Struktur kristal
Segienam Sederhana
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.
Elektron per kulit
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
Sifat Fisika
Fase
Solid
Kepadatan
6,773 g/cm3
Titik lebur
1208,15 K | 935 °C | 1715 °F
Titik didih
3793,15 K | 3520 °C | 6368 °F
Kalor peleburan
6,9 kJ/mol
Kalor penguapan
330 kJ/mol
Kapasitas kalor molar
0,193 J/g·K
Kelimpahan di kerak bumi
0,00086%
Kelimpahan di alam semesta
2×10-7%
Ultrapure
Kredit Gambar: Images-of-elements
Ultrapure praseodymium pieces under argon
Nomor CAS
7440-10-0
PubChem CID Number
23942
Sifat Atom
Jari-jari atom
182 pm
Jari-jari kovalen
203 pm
Elektronegativitas
1,13 (Skala Pauling)
Potensi Ionisasi
5,473 eV
Volume atom
20,8 cm3/mol
Kondusivitas termal
0,125 W/cm·K
Bilangan oksidasi
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