Comparison of Europium and Ytterbium

Attribute	Ytterbium ×	Europium ×
Atomic mass (u)	173.05	151.964
Standard state	Solid	Solid
Oxidation states	+2 +3	+2 +3
Electron configuration	[Xe]6s²4f¹⁴	[Xe]6s²4f⁷
Ionization energy (eV)	6.254	5.67
Atomic radius (van der waals) (pm)	242	233
Boiling point (K)	1469	1802
Melting point (K)	1092	1095
Density (g/cm³)	6.9	5.24
Atomic number	70	63
Group name	Lanthanide	Lanthanide
Discovered (year)	1878	1901
Symbol	Yb	Eu