Helium: Difference between revisions
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imported>Milton Beychok (Added some info to the infobox) |
imported>Milton Beychok m (Abit more info) |
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|properties= Inert, colorless, odorless, non-toxic, non-flammable gas | |properties= Inert, colorless, odorless, non-toxic, non-flammable gas | ||
|compounds= | |compounds= | ||
|uses=Cryogenics, welding, inert purging gas | |uses=Cryogenics, welding, inert purging gas, scientific uses | ||
|hazard= | |hazard= | ||
}} | }} | ||
'''Helium''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] He. Its [[atomic number]] (the number of [[proton]]s) is 2. It has a [[Atomic mass#Standard atomic weights of the elements|standard atomic weight]] of 4.002602, and is typically found as a [[gas]] in its elemental form. | '''Helium''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] He. Its [[atomic number]] (the number of [[proton]]s) is 2. It has a [[Atomic mass#Standard atomic weights of the elements|standard atomic weight]] of 4.002602, and is typically found as a [[gas]] in its elemental form. | ||
Helium is considered to be a member of the " | Helium is considered to be a member of the "Noble gas" class of element. At a [[pressure]] of 101.325 k[[Pascal (unit)|Pa]], it has a [[boiling point]] of -268.93 °[[Celsius (unit)|C]], and a [[melting point]] of -272.2 °C. | ||
Revision as of 22:52, 16 April 2011
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Helium is a chemical element, having the chemical symbol He. Its atomic number (the number of protons) is 2. It has a standard atomic weight of 4.002602, and is typically found as a gas in its elemental form.
Helium is considered to be a member of the "Noble gas" class of element. At a pressure of 101.325 kPa, it has a boiling point of -268.93 °C, and a melting point of -272.2 °C.