Praseodymium

59
Pr
Groep
n.v.t.
Periode
6
Blok
f
Protonen
Elektronen
Neutronen
59
59
82
Algemene Eigenschappen
Atoomnummer
59
Atomair gewicht
140,90765
Massa Getal
141
Categorie
Lanthaniden
Kleur
Zilver
Radioactief
Nee
From the Greek word prasios, green, and didymos, twin
Kristalstructuur
Eenvoudige Hexagonaal
Historie
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.
Eletronen per schil
2, 8, 18, 21, 8, 2
Electronconfiguratie
[Xe] 4f3 6s2
Pr
Praseodymium is usually stored under a light mineral oil or sealed in glass
Fysieke Eigenschappen
Fase
Vast
Dichtheid
6,773 g/cm3
Smeltpunt
1208,15 K | 935 °C | 1715 °F
Kookpunt
3793,15 K | 3520 °C | 6368 °F
Fusiewarmte
6,9 kJ/mol
Verdampingswarmte
330 kJ/mol
Specifieke Warmtecapaciteit
0,193 J/g·K
Overvloedig aanwezig in de aardkorst
0,00086%
Overvloedig aanwezig in het universum
2×10-7%
Ultrapure
Verdiensten voor afbeeldingen: Images-of-elements
Ultrapure praseodymium pieces under argon
CAS-nummer
7440-10-0
PubChem CID nummer
23942
Atoomeigenschappen
Atoomstraal
182 pm
Covalentiestraal
203 pm
Electronegativiteit
1,13 (Pauling schaal)
Ionisatiepotentiaal
5,473 eV
Atoomvolume
20,8 cm3/mol
Thermische geleiding
0,125 W/cm·K
Oxidatietoestanden
2, 3, 4
Toepassingen
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
Isotopen
Stabiele isotopen
141Pr
Instabiele isotopen
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