Comparison of Beryllium and Dysprosium

Attribute	Dysprosium ×	Beryllium ×
Standard state	Solid	Solid
Electron configuration	[Xe]6s²4f¹⁰	[He]2s²
Atomic mass (u)	162.5	9.012183
Electronegativity (pauling scale)	1.22	1.57
Oxidation states	+3	+2
Ionization energy (eV)	5.939	9.323
Atomic radius (van der waals) (pm)	229	153
Boiling point (K)	2840	2744
Melting point (K)	1685	1560
Density (g/cm³)	8.55	1.85
Atomic number	66	4
Group name	Lanthanide	Alkaline earth metal
Discovered (year)	1886	1798
Symbol	Dy	Be