Comparison of Phosphorus and Iodine

Attribute	Iodine ×	Phosphorus ×
Atomic mass (u)	126.9045	30.973762
Standard state	Solid	Solid
Oxidation states	-1 +1 +5 +7	-3 +3 +5
Electron configuration	[Kr]5s²4d¹⁰5p⁵	[Ne]3s²3p³
Atomic radius (van der waals) (pm)	198	180
Electronegativity (pauling scale)	2.66	2.19
Electron affinity (eV)	3.059	0.746
Ionization energy (eV)	10.451	10.487
Boiling point (K)	457.55	553.65
Melting point (K)	386.85	317.3
Density (g/cm³)	4.93	1.82
Atomic number	53	15
Group name	Halogen	Nonmetal
Discovered (year)	1811	1669
Symbol	I	P