Group 18

He
1 pt
What is a new spectral line was observed in solar radiation?
First evidence that helium existed
2 pt
What is 4:1 oxygen:helium?
Ratio of helium to oxygen used for diver breathing gas
3 pt
What is "sun" (Greek)?
Meaning of the name helium
4 pt
What is 23%?
Percentage of the universe composed of helium (+/- 5%)
5 pt
What is helium-II (a "superfluid" that flows without viscosity)?
Form of helium only observed when cooled below 2.2K
Ne
1 pt
Who are Ramsay and Travers? (distilled remaining liquid from air after cooling, obtained Ne, Xe, and Kr)
Discoverer of neon
2 pt
What is the atmosphere? (low-temperature distillation of air, also used for Ar, Kr, and Xe)
Major source of neon
3 pt
What is "new" (Greek)?
Origin of the name neon
4 pt
What is the helium-neon (He-Ne) laser?
Common laser using neon as part of it's lasing medium
5 pt
What is 3-15 kV?
Typical voltage used in a neon sign to get the gas to "glow" (+/- 10%)
Ar
1 pt
What is A?
Previous symbol of argon prior to 1957
2 pt
Who are Rayleigh and Ramsey? (in 1894)
Discoverers of argon
3 pt
What is "inactive" (Greek)?
Meaning of the name argon
4 pt
What is asphyxiant?
Major use of argon in the poultry industry
5 pt
What is HArF?
Metastable argon compound discovered at the University of Hawaii in 2000
Kr
1 pt
What is blue? (makes people look better, but makes bulb much more expensive)
Color contributed by krypton in fluorescent lamps to improve their overall light output
2 pt
What is 1904?
Year Ramsay was honored with the Nobel prize for discovereing noble gases (+/- 5 yrs)
3 pt
What is the definition of the meter? (equivalent to 1,650,763.73 wavelengths in a vacuum of Kr-86 emission)
Standard associated with krypton-86 from 1960-1983
4 pt
What is "hidden" (Greek)?
Meaning of the name krypton
5 pt
What is the University of Helsinki (Finland)?
Location of the discovery of the compounds HKrCN and HKrCCH
Xe / Rn
1 pt
What is flash lamps (or arc lamps)?
Major commercial use of xenon
2 pt
What is it's radioactivity? (occurrs naturally from uranium decay, can get trapped in homes and be a hazard)
Major problem associated with radon
3 pt
What is anesthesia (although it's quite expensive)?
Usage of xenon of interest to physicians
4 pt
What is "strange" (Greek)?
Meaning of the name xenon
5 pt
What is XeF_n_ (n=2, 4, or 6)?
First xenon compound observed by Neil Bartlett in 1962
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