Comparison of Xenon and Astatine

Attribute	Astatine ×	Xenon ×
Standard state	Solid	Gas
Electron affinity (eV)	2.8	-
Electron configuration	[Xe]6s²4f¹⁴5d¹⁰6p⁵	[Kr]5s²4d¹⁰5p⁶
Atomic mass (u)	209.98715	131.29
^1↑Electronegativity (pauling scale)	2.2	2.6
Oxidation states	-1 1 3 5 7	0
Ionization energy (eV)	9.5	12.13
Atomic radius (van der waals) (pm)	202	216
Boiling point (K)	-	165.03
Melting point (K)	575	161.36
Density (g/cm³)	7	0.005887
Atomic number	85	54
Group name	Halogen	Noble gas
Discovered (year)	1940	1898
Symbol	At	Xe