Helium



**Helium** By: Sebastian


 * Atomic Number: ** 2


 * Protons: ** 2


 * Electrons: ** 2


 * Neutrons: ** 2


 * Average Atomic Mass: ** 4.002602


 * Isotopes: ** He-3 and He-4


 * Discovery: ** Sir Norman Lockyer noticed a line in the Sun's spectrum during a solar eclipse could not be produced by any known element. He named this element Helium.


 * Name: ** Helium was named after the Greek god of the Sun, Helios.


 * Uses:** Helium is used in balloons/blimps, a cooling medium for nuclear reactors, and as a gas for supersonic wind tunnels.


 * Interesting Facts**: Helium has the lowest melting point amongst all the elements and makes your voice sound like a chipmunk due to the fact that helium is less dense than atmospheric air which changes the pitch of ones voice when inhaled.


 * Video:** media type="youtube" key="a8FJEiI5e6Q" height="344" width="425"
 * Sources**:
 * [|www.webelements.com/helium] ; [|www.education.jlab.org/itselemental/elea02.html] ; [|www.chemicalelements.com/elements/he.html] ; http://www.clusterballoon.org/index/index_01.jpg ; http://www.youtube.com/watch?v=a8FJEiI5e6Q