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

Isotopes

Facts

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

Source:

Bentor, Yinon. Chemical Element.com - Helium. Apr. 30, 2008 <http://www.chemicalelements.com/elements/he.html>.