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62
Eu
63
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64
Pu
94
Am
95
Cm
96

 

Periodic table

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Europium

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Europium

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Europium

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Europio

 

Eu
Eu
Europium

PERIODIC TABLE OF THE ELEMENTS

EUROPIUM

TRANSITION ELEMENT:
LANTHANIDE

 

Atomic number:63

Group numbers:3

Period:6

Electronic configuration:[Xe] 4f7 6s2

Formal oxidation number:+2 +3

Electronegativities:-

Atomic radius / pm:199.5

Relative atomic mass:151.964 ± 0.001

 

Europium was discovered by Eugène-Anatole Demarçay (FR) in 1896. Named for the continent of Europe. It is a soft, silvery-white metal that is extremely reactive with oxygen and water. Europium is obtained from monazite sand, which is a mixture of phosphates of calcium, thorium, cerium and most other rare earths. It is used with yttrium oxide to make red phosphors for colour televisions.

PHYSICAL PROPERTIES

Density / g dm-3:5243 (293 K)

Molar volume / cm3mol-1:28.98 (293 K)

Electrical resistivity / μΩcm:90 (20 °C)

THERMAL PROPERTIES

Thermal conductivity / W m-1K-1:13.9

Melting point / °C:822

Boiling point / °C:1529

Heat of fusion / kJ mol-1:10.5

Heat of vaporization / kJ mol-1:176

Heat of atomization / kJ mol-1:177.11

IONIZATION ENERGIES

First ionization energy / kJ mol-1:547.11

Second ionization energy / kJ mol-1:1084.60

Third ionization energy / kJ mol-1:2404.43

ABUNDANCE OF ELEMENTS

in the atmosphere / ppm:-

in the Earth's crust / ppm:1.1

in the oceans / ppm:0.00000004

CRYSTALLOGRAPHIC DATA

body-centered cubic

Crystal structure:

body-centered cubic

Unit-cell dimensions / pm:

a=458.20

Space group:

Im3m

ISOTOPES

IsotopeRelative atomic massMass percent (%)
151Eu150.919846(3)47.8(15)
153Eu152.921226(3)52.2(15)

REDUCTION POTENTIALS

Balanced half-reaction Eo / V

 

62 Samarium <=
63 Europium
=> 64 Gadolinium