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
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