Element Melting
point /K
fusH(mp) / kJ mol1 Boiling point /K vapH(bp) / kJ mol1 Van der Waals
radius (rv) /pm
Helium ‡ – 4.2 0.08 99
Neon 24.5 0.34 27 1.71 160
Argon 84 1.12 87 6.43 191
Krypton 116 1.37 120 9.08 197
Xenon 161 1.81 165 12.62 214
Radon 202 – 211 18 –
‡Helium cannot be solidified under atmospheric pressure, the pressure condition for which all other phase changes in the table are considered