Symbol: He
Atomic Number: 2
Mass: 4.0026
Melting Point: -272
Boiling Point: -268.6
Number of Protons/Electrons: 2
Number of Neutrons: 2
Classification: Noble Gas
Crystal Structure: Hexagonal
Density: 0.1785
Color: colorless
Atomic Structure
Number of Energy Levels: 1
First Energy Level: 2
Isotopes
Isotope
Half Life
He-3
Stable
He-4
Stable
Facts
Date of Discovery: 1895
Discoverer: Sir William Ramsey
Name Origin: From the Greek word hêlios (sun)
Uses: balloons, deep sea diving
Obtained From: natural gas deposit, air
Related Links
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![[ATOM]](atom.gif)
![[Bohr Model of Helium]](b0002.gif)
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