Comparison of Neon and Argon

Attribute	Argon ×	Neon ×
Atomic mass (u)	39.9	20.18
Standard state	Gas	Gas
Oxidation states	0	0
Electron configuration	[Ne]3s²3p⁶	[He]2s²2p⁶
Ionization energy (eV)	15.76	21.565
Atomic radius (van der waals) (pm)	188	154
Boiling point (K)	87.3	27.07
Melting point (K)	83.8	24.56
Density (g/cm³)	0.0017837	0.0008999
Atomic number	18	10
Group name	Noble gas	Noble gas
Discovered (year)	1894	1898
Symbol	Ar	Ne