Comparison of Rubidium and Polonium

Attribute	Polonium ×	Rubidium ×
Atomic mass (u)	208.98243	85.468
Standard state	Solid	Solid
Oxidation states	+2 +4	+1
Electron configuration	[Xe]6s²4f¹⁴5d¹⁰6p⁴	[Kr]5s¹
Atomic radius (van der waals) (pm)	197	303
Electronegativity (pauling scale)	2	0.82
Electron affinity (eV)	1.9	0.468
Ionization energy (eV)	8.417	4.177
Boiling point (K)	1235	961
Melting point (K)	527	312.46
Density (g/cm³)	9.32	1.53
Atomic number	84	37
Group name	Metalloid	Alkali metal
Discovered (year)	1898	1861
Symbol	Po	Rb