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
Crystal Structure: Hexagonal
Density @ 293 K: 0.1785 g/cm3
Color: colorless
Atomic Structure
![[Bohr Model of Helium]](b0002.gif) |
Number of Energy Levels: 1 First Energy Level: 2 |
Isotopes
| Isotope | Half Life |
| He-3 | Stable |
| He-4 | Stable |
Facts
Date of Discovery: 1895Discoverer: Sir William Ramsey
Name Origin: From the Greek word hêlios (sun)
Uses: balloons, deep sea diving
Obtained From: natural gas deposit, air
Information provided by: http://www.chemicalelements.com