Comparison of Phosphorus and Rubidium

Attribute	Phosphorus ×	Rubidium ×
Atomic mass (u)	30.973762	85.468
Standard state	Solid	Solid
Oxidation states	-3 +3 +5	+1
Electron configuration	[Ne]3s²3p³	[Kr]5s¹
Atomic radius (van der waals) (pm)	180	303
Electronegativity (pauling scale)	2.19	0.82
Electron affinity (eV)	0.746	0.468
Ionization energy (eV)	10.487	4.177
Boiling point (K)	553.65	961
Melting point (K)	317.3	312.46
Density (g/cm³)	1.82	1.53
Atomic number	15	37
Group name	Nonmetal	Alkali metal
Discovered (year)	1669	1861
Symbol	P	Rb