(EN) Something about helium ....
HELIUM
Znažčka : He
Atomic number : 2
atomic weight : 4.0026 g / mol
Helium is one of the noble gas group on the periodic table. This is the second lightest element .
The main sources of helium in the world is a series of natural gas fields in the United States .
Helium on Earth occurs only very rarely . The Earth's atmosphere occurs only at higher
layers, due to its extremely low weight of the atmosphere gradually fades into
interplanetary space .
A lesser amount is found in natural gas , which is obtained from freeze . helium
and rarely rises from cracks in the ground, the area 's most famous springs are located in the Rocky
Mountains in the United States . It is assumed that this product is helium nuclear decay of elements in the Earth's
cortex .
In the universe after hydrogen , helium is the second most represented elements . It occurs mainly
in all luminous stars, which is one of the intermediates in controlled thermonuclear fusion , which
according to current theories of basic energy source in the universe . About 25% of
mass surrounding the observable universe .
Article prepared by Dominik Kopiar