Helium

Position of phosphorus in the periodic table.

Helium is a chemical element with the symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas and the first in the noble gas group in the periodic table. Its boiling and melting point are the lowest among all the elements. It is the second lightest and second most abundant element in the observable universe (hydrogen is the lightest and most abundant).

Helium's industrial uses include as a pressurizing and purge gas, as a protective atmosphere for arc welding, and in processes such as growing crystals to make silicon wafers, as well as a lifting gas in balloons and airships.

See also

• Carbon
• Hydrogen
• Nitrogen
• Oxygen
• Phosphorus
• Sulfur
• Chemical elements

References

This article uses material from the Wikipedia article Helium, which is released under the Creative Commons Attribution-ShareAlike 3.0 Unported License (view authors).