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Xenon

Xenon. Tracy Furutani Chemistry 162 6/10/2009. Xenon. Group 8A Odorless, colorless (noble) gas Inert, makes few compounds Ideal for monitoring nuclear tests because it does not form compounds Detected by air sampling and mass spectrometry. North Korea.

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Xenon

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  1. Xenon Tracy Furutani Chemistry 162 6/10/2009

  2. Xenon • Group 8A • Odorless, colorless (noble) gas • Inert, makes few compounds • Ideal for monitoring nuclear tests because it does not form compounds • Detected by air sampling and mass spectrometry

  3. North Korea • Suspected of detonating an underground nuclear test explosion October 9, 2006 • Seismic stations detected ground waves but could not tell if the test was successful -- the high explosives to trigger the nuclear device could have exploded but not the fissionable material

  4. The key equation

  5. What is detected • Xe-133 and Xe-135 have half-lives of 5.24 days and 9.10 hours respectively, so last long enough after the test that the gas cloud can be detected offshore • However, both are vented by nuclear power stations as well • Xe-135 to Xe-133 marked different between explosions and power stations

  6. Bibliography • Zhang, Hui, Off-site Air Sampling Analysis and North Korean Nuclear Test, Kennedy School of Government, belfcenter.ksg.harvard.edu/files/NKSampling_INMM07_Hui.pdf, 2006 • United Press International, South Korea: Nuke test evidence hard to find, June 9, 2008

  7. Problem presentation • 14.138 (a) Why do stable xenon fluorides have an even number of F atoms? Answer:

  8. Problem presentation • 14.138 (a) Why do stable xenon fluorides have an even number of F atoms? Answer: Xenon has eight valence electrons and fluorine has seven; in order for any molecule to be stable, it must have octets (or a set of filled pairs of electrons, anyway), which means that there must be an even number of electrons. Thus, there must be an even number of fluorine atoms in order to have an even number of total electrons.

  9. 14.138 (b) Why do the ionic species XeF3+ and XeF7– have odd numbers of F atoms? • 14.138 (c) Predict the shape of XeF3+.

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