Comparison of Beryllium and Holmium

Attribute	Holmium ×	Beryllium ×
Standard state	Solid	Solid
Electron configuration	[Xe]6s²4f¹¹	[He]2s²
Atomic mass (u)	164.93033	9.012183
Electronegativity (pauling scale)	1.23	1.57
Oxidation states	+3	+2
Ionization energy (eV)	6.022	9.323
Atomic radius (van der waals) (pm)	216	153
Boiling point (K)	2973	2744
Melting point (K)	1747	1560
Density (g/cm³)	8.8	1.85
Atomic number	67	4
Group name	Lanthanide	Alkaline earth metal
Discovered (year)	1878	1798
Symbol	Ho	Be