Europium

63
Eu
Grupp
n/a
Period
6
Block
f
Protoner
Elektroner
Neutroner
63
63
89
Generella Egenskaper
Atomnummer
63
Atommassa
151,964
Masstal
152
Kategori
Lantanoider
Färg
Silver
Radioaktiv
Nej
Europium was named after Europe
Kristallstruktur
Rymdcentrerat kubisk
Historia
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 per skal
2, 8, 18, 25, 8, 2
Elektronkonfiguration
[Xe] 4f7 6s2
Eu
Europium is the most reactive rare earth element
Fysikaliska Egenskaper
Aggregationstillstånd
Fast
Densitet
5,243 g/cm3
Smältpunkt
1099,15 K | 826 °C | 1518,8 °F
Kokpunkt
1802,15 K | 1529 °C | 2784,2 °F
Smältvärme
9,2 kJ/mol
Ångbildningsvärme
175 kJ/mol
Specifik värmekapacitet
0,182 J/g·K
Abundance in Earth's crust
0,00018%
Abundance in Universe
5×10-8%
Weakly
Bildkrediter: Images-of-elements
Weakly oxidized europium, hence slightly yellowish
CAS Number
7440-53-1
PubChem CID Number
23981
Atomära Egenskaper
Atomradie
180 pm
Kovalent radie
198 pm
Elektronegativitet
1,2 (Paulingskalan)
Jonisationspotential
5,6704 eV
Molvolym
20,8 cm3/mol
Värmeledningsförmåga
0,139 W/cm·K
Oxidationstillstånd
2, 3
Användningsområden
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
Stabila isotoper
151Eu, 153Eu
Instabila 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