HELIUM

The helium is a chemical element of atomic number 2, symbol. Him one places in the group 18 of the periodic table of the elements. He presents the properties of a rare gas.

During a solar eclipse in 1868, the French astronomer Pierre Janssen observed a spectral yellow line in the solar light that up to this moment was not known. Norman Lockyer observed the same eclipse and proposed that the above mentioned line was produced by a new element, to which it called helium, with which, both to Lockyer and to Janssen they there was awarded the discovery of this element.
The helium uses in cryogenics and in the refrigeration of magnets superconductors.
The helium is the most light second element and the second most abundant in the universe.
In normal conditions of pressure and temperature the helium is a not inflammable gas.

Information obtained of http://www.wikipedia.org/