Europium
63
Eu
Gruppe
n/a
Periode
6
Blok
f
Protoner
Elektroner
Neutroner
63
63
89
Generelle Egenskaber
Atomnummer
63
Atommasse
151,964
Masseantal
152
Kategori
Lantanider
Farve
Sølv
Radioaktiv
Nej
Europium was named after Europe
Krystalstruktur
Rumcentreret Kubisk
Historie
Europium was first found by Paul Émile Lecoq de Boisbaudran in 1890.
In 1896, French chemist Eugène-Antole Demarçay identified spectroscopic lines in ‘samarium' caused by europium.
He successfully isolated europium in 1901 using repeated crystallizations of samarium magnesium nitrate.
In 1896, French chemist Eugène-Antole Demarçay identified spectroscopic lines in ‘samarium' caused by europium.
He successfully isolated europium in 1901 using repeated crystallizations of samarium magnesium nitrate.
Elektroner i hver skal
2, 8, 18, 25, 8, 2
Elektronkonfiguration
[Xe] 4f7 6s2
Europium is the most reactive rare earth element
Fysiske Egenskaber
Tilstandsform
Fast stof
Massefylde
5,243 g/cm3
Smeltepunkt
1099,15 K | 826 °C | 1518,8 °F
Kogepunkt
1802,15 K | 1529 °C | 2784,2 °F
Smeltevarme
9,2 kJ/mol
Fordampningsvarme
175 kJ/mol
Varmefylde
0,182 J/g·K
Forekomst i jordskorpen
0,00018%
Forekomst i universet
5×10-8%
CAS-nummer
7440-53-1
PubChem CID-nummer
23981
Atomare egenskaber
Atomradius
180 pm
Kovalent radius
198 pm
Elektronegativitet
1,2 (Paulings skala)
Ioniseringspotentiale
5,6704 eV
Atomvolumen
20,8 cm3/mol
Varmeledningsevne
0,139 W/cm·K
Oxidationstrin
2, 3
Anvendelser
Europium is used in the manufacture of fluorescent glass.
It is also used in the anti-counterfeiting phosphors in Euro banknotes.
Europium-doped plastic has been used as a laser material.
Europium isotopes are good neutron absorbers and are used in nuclear reactor control rods.
It is also used in the anti-counterfeiting phosphors in Euro banknotes.
Europium-doped plastic has been used as a laser material.
Europium isotopes are good neutron absorbers and are used in nuclear reactor control rods.
Europium is considered to be mildly toxic
Isotoper
Stabile isotoper
151Eu, 153EuUstabile isotoper
130Eu, 131Eu, 132Eu, 133Eu, 134Eu, 135Eu, 136Eu, 137Eu, 138Eu, 139Eu, 140Eu, 141Eu, 142Eu, 143Eu, 144Eu, 145Eu, 146Eu, 147Eu, 148Eu, 149Eu, 150Eu, 152Eu, 154Eu, 155Eu, 156Eu, 157Eu, 158Eu, 159Eu, 160Eu, 161Eu, 162Eu, 163Eu, 164Eu, 165Eu, 166Eu, 167Eu