63 - Europium lanthanide
Discovered by Eugène-Anatole Demarçay in 1901
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.
Periodic table
| Shell | Electrons | Orbitals |
|---|---|---|
| 1 | 2 | 2 in 1s |
| 2 | 8 | 2 in 2s + 6 in 2p |
| 3 | 18 | 2 in 3s + 6 in 3p + 10 in 3d |
| 4 | 25 | 2 in 4s + 6 in 4p + 10 in 4d + 7 in 4f |
| 5 | 8 | 2 in 5s + 6 in 5p |
| 6 | 2 | 2 in 6s |
Electron shells
152 u Atomic Mass
1.85 Å Atomic Radius
1.8k K Boiling Point
9 Group
2, 3 Common Oxidation States
1.98 Å Covalent Radius
5.26 g/cm³ Density
11.2 kJ/mol Electron Affinity
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f7 Electron Configuration
[Xe] 4f7 6s2 Electron Configuration (semantic)
1.2 Electronegativity
63 Electrons
5.67 eV First Ionization Energy
2, 3 ICSD Oxidation States
547.1, 1085, 2404, 4120 kJ/mol Ionization Energies
1.1k K Melting Point
18 Mendeleev Number
27.7 J/(mol·K) Molar Heat
6 Number of Shells
89 Neutrons
63 Atomic Number
21 Number of Isotopes
2, 3 Oxidation States
6 Period
Solid Phase
63 Protons
2, 8, 18, 25, 8, 2 Electron Shell Occupations
0.182 J/(g K) Specific Heat