Europium

Element 63 on the periodic table, symbol Eu, group 3, period 6.

Europium is a chemical element with symbol Eu and atomic number 63. It was isolated in 1901 and is named after the continent of Europe. It is a moderately hard, silvery metal which readily oxidizes in air and water.

Properties

Atomic Number: 63
Atomic Mass: 151.9641 u
Group: 3
Period: 6
Block: f-block
Category: Lanthanide
State at 25 °C: Solid
Melting Point: 1,099 K · 825.9 °C
Boiling Point: 1,802 K · 1,528.9 °C
Density: 5.264 g/cm³
Atomic Radius: 185 pm
Electronegativity: 1.2
Oxidation States: +2, +3
Abundance in Crust: 2 mg/kg
Discovered: 1901
Discovered By: Eugène-Anatole Demarçay

Electron Configuration

[Xe] 4f7 6s2

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f7

Ionisation Energies (kJ/mol)

1. 547.1
2. 1,085
3. 2,404
4. 4,120

Elements near Europium

Elements in the same group share the number of outer electrons and behave in similar ways. Elements in the same period share a shell, so they change steadily from left to right.