Comparison of Helium and Neon

Attribute	Neon ×	Helium ×
Atomic mass (u)	20.18	4.0026
Standard state	Gas	Gas
Oxidation states	0	0
Electron configuration	[He]2s²2p⁶	1s²
Ionization energy (eV)	21.565	24.587
Atomic radius (van der waals) (pm)	154	140
Boiling point (K)	27.07	4.22
Melting point (K)	24.56	0.95
Density (g/cm³)	0.0008999	0.0001785
Atomic number	10	2
Group name	Noble gas	Noble gas
Discovered (year)	1898	1868
Symbol	Ne	He