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Helium at Chemical Elements.com
Basic Information | Atomic Structure | Isotopes | Related Links | Citing This Page


Basic Information


Name: Helium
Symbol: He
Atomic Number: 2
Atomic Mass: 4.002602 amu
Melting Point: -272.0 °C (1.15 K, -457.6 °F)
Boiling Point: -268.6 °C (4.549994 K, -451.48 °F)
Number of Protons/Electrons: 2
Number of Neutrons: 2
Classification: Noble Gas
Crystal Structure: Hexagonal
Density @ 293 K: 0.1785 g/cm3
Color: colorless


Atomic Structure

[Bohr Model of Helium]  
Number of Energy Levels: 1

    First Energy Level: 2

Isotopes

Isotope Half Life
He-3Stable
He-4Stable

Facts


Date of Discovery: 1895
Discoverer: Sir William Ramsay
Name Origin: From the Greek word hÍlios (sun)
Uses: balloons, deep sea diving
Obtained From: natural gas deposit, air

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MLA Format for Citing This Page


Bentor, Yinon. Chemical Element.com - Helium. <http://www.chemicalelements.com/elements/he.html>.

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