Comparison of Astatine and Radon

Attribute	Astatine ×	Radon ×
Standard state	Solid	Gas
Boiling point (K)	-	211.45
Electron configuration	[Xe]6s²4f¹⁴5d¹⁰6p⁵	[Xe]6s²4f¹⁴5d¹⁰6p⁶
Atomic mass (u)	209.98715	222.01758
Electronegativity (pauling scale)	2.2	-
Oxidation states	-1 1 3 5 7	0
Ionization energy (eV)	9.5	10.745
Atomic radius (van der waals) (pm)	202	220
Melting point (K)	575	202
Electron affinity (eV)	2.8	-
Density (g/cm³)	7	0.00973
Atomic number	85	86
Group name	Halogen	Noble gas
Symbol	At	Rn
Discovered (year)	1940	1900