Noble Gas

6 elements

Inert gases in Group 18 with full valence shells. They have very low reactivity due to their stable electron configurations. Noble gases are colorless, odorless, and monatomic, with very low boiling points.

2 Gas He Helium 4.0026 u

MP: -272.2 °C BP: -268.9 °C

10 Gas Ne Neon 20.18 u

MP: -248.6 °C BP: -246.0 °C

18 Gas Ar Argon 39.948 u

MP: -189.3 °C BP: -185.8 °C

36 Gas Kr Krypton 83.798 u

MP: -157.4 °C BP: -153.2 °C

54 Gas Xe Xenon 131.29 u

MP: — BP: —

86 Gas Rn Radon 222.0 u

MP: — BP: —

Comparison Table

#	Symbol	Name	Mass (u)	Melting Pt	Boiling Pt	Density	Phase
2	He	Helium	4.0026	-272.2 °C	-268.9 °C	0.0001785	Gas
10	Ne	Neon	20.18	-248.6 °C	-246.0 °C	0.0008999	Gas
18	Ar	Argon	39.948	-189.3 °C	-185.8 °C	0.0017837	Gas
36	Kr	Krypton	83.798	-157.4 °C	-153.2 °C	0.003749	Gas
54	Xe	Xenon	131.29	—	—	—	Gas
86	Rn	Radon	222.0	—	—	—	Gas