Europium

63
Eu
Gruppe
n/a
Periode
6
Blok
f
Protons
Electrons
Neutrons
63
63
89
General Properties
Atomnummer
63
Atommasse
151,964
Mass Number
152
Kategori
Lantanider
Farve
Silver
Radioactive
Nej
Europium was named after Europe
Krystalstruktur
Rumcentreret Kubisk
History
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.
Elektroner i hver skal
2, 8, 18, 25, 8, 2
Elektronkonfiguration
[Xe] 4f7 6s2
Eu
Europium is the most reactive rare earth element
Physical Properties
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
Abundance in Earth's crust
0,00018%
Abundance in Universe
5×10-8%
Weakly
Billede akkrediteringer: Images-of-elements
Weakly oxidized europium, hence slightly yellowish
CAS Number
7440-53-1
PubChem CID Number
23981
Atomic Properties
Atomradius
180 pm
Kovalent radius
198 pm
Elektronegativitet
1,2 (Paulings skala)
Ionization Potential
5,6704 eV
Atomic Volume
20,8 cm3/mol
Varmeledningsevne
0,139 W/cm·K
Oxidationstrin
2, 3
Applications
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.
Europium is considered to be mildly toxic
Isotoper
Stable Isotopes
151Eu, 153Eu
Unstable Isotopes
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