Comparison of Ytterbium and Radium

Attribute	Radium ×	Ytterbium ×
Electronegativity (pauling scale)	0.9	-
Atomic mass (u)	226.02541	173.05
Standard state	Solid	Solid
Oxidation states	+2	+2 +3
Electron configuration	[Rn]7s²	[Xe]6s²4f¹⁴
Ionization energy (eV)	5.279	6.254
Atomic radius (van der waals) (pm)	283	242
Boiling point (K)	1413	1469
Melting point (K)	973	1092
Density (g/cm³)	5	6.9
Atomic number	88	70
Group name	Alkaline earth metal	Lanthanide
Discovered (year)	1898	1878
Symbol	Ra	Yb