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 VISUAL CHEMISTRY

HELIUM
PROPERTIES
Relative atomic mass 4.0026
Atomic mass (kg) 6.68  x 10-27
Density (g/cm3) 0.147
Physical State at STP Monatomic gas (He)
Melting point (°C) - 270
Boiling point (°C) - 269
Crystal Structure of solid element Close packed hexagonal
Stable isotopes 3He, 4He

STP = standard temperature and pressure. Usually considered as room temperature and pressure.
 

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