Comparison of Iodine and Radon

Attribute	Iodine ×	Radon ×
Atomic mass (u)	126.9045	222.01758
Standard state	Solid	Gas
Oxidation states	-1 +1 +5 +7	0
Electron configuration	[Kr]5s²4d¹⁰5p⁵	[Xe]6s²4f¹⁴5d¹⁰6p⁶
Atomic radius (van der waals) (pm)	198	220
Electronegativity (pauling scale)	2.66	-
Electron affinity (eV)	3.059	-
Ionization energy (eV)	10.451	10.745
Boiling point (K)	457.55	211.45
Melting point (K)	386.85	202
Density (g/cm³)	4.93	0.00973
Atomic number	53	86
Group name	Halogen	Noble gas
Symbol	I	Rn
Discovered (year)	1811	1900