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helium [He]
From the Greek helios meaning sun
Discovered 1872 [1]
Discovered on earth in 1895 by William Ramsay. [2]
Discovered in the sun's spectrum in 1868 by Janssen & Lockyear.
Occurrence:
1) natural gas deposits within the earth
2) can be isolated from air (lowest of any element)
Characteristics:
1) light colorless non-flammable gaseous element
2) boiling point 4.2 degrees Kelvin
Uses:
1) inflating airships & balloons
2) filling incandescent lamps
3) deep sea diving, added to air to protect againts the bends
3) cryogenic research
Related
periodic table
General
inert gas (noble gas, rare gas)
bioagent
Properties
SIZE: AW = 4.0026
atomic number
VALUE: 2
VALENCE: 1S2
References
- Webster's Ninth New Collegiate Dictionary, Miriam-
Webster Inc. Springfield, MA 1990
- Chemical & Engineering News, Sept 8, 2003
Component-of
heliox (helium/oxygen)
helium/n2/o2
helium/o2
helium/oxygen