Comparison of Strontium and Ytterbium

Attribute	Ytterbium ×	Strontium ×
Standard state	Solid	Solid
Electron configuration	[Xe]6s²4f¹⁴	[Kr]5s²
Atomic mass (u)	173.05	87.62
Electronegativity (pauling scale)	-	0.95
Oxidation states	+2 +3	+2
Ionization energy (eV)	6.254	5.695
Atomic radius (van der waals) (pm)	242	249
Boiling point (K)	1469	1655
Melting point (K)	1092	1050
Density (g/cm³)	6.9	2.64
Atomic number	70	38
Group name	Lanthanide	Alkaline earth metal
Symbol	Yb	Sr
Discovered (year)	1878	1790