01 About Helium
Discovered in the Sun before found on Earth. The only element that stays liquid all the way to absolute zero under normal pressure.
02 Physical Properties
State at room temperature๐จ Gas
Melting pointDoes not melt (noble gas)
Boiling point-268.9 ยฐC
Density0.000164 g/cmยณ
Atomic mass4.003 u
Electron configuration2
Period / GroupPeriod 1, Group 18
BlockS-block
03 Discovery
Helium was discovered in 1868 by Janssen/Lockyer.