________ is used in discharge tubes and fluorescent bulbs for displays.
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Xenon
________ and Radon are the rarest elements of the group.
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XeF2
________ has linear structure, XeF4 has square planar structure and XeF6 has distorted octahedral structure since it has 6 bonding pairs and a lone pair.
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noble gases
All ________ have general electronic configuration ns2 np6 except helium which has ns2 configuration.
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Neil Bartlett
________, at the University of British Columbia, noticed the reaction of a noble gas in March 1962.
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helium
Group 18 consists of six elements: ________, neon, argon, krypton, xenon and radon.
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XeO3
________ is a colorless explosive solid and has a pyramidal molecular structure.
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XeF6
________ can also be synthesized by reaction between XeF4 and O2F2.
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Argon
________ is used mainly to provide an inert atmosphere in high temperature.
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Helium
_______ is used to produce superconducting magnets which form an essential part of modern NMR spectrometers and Magnetic Resonance Imaging (MRI) systems.
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XeF4
XeF2, ________ and XeF6 are colorless crystalline solids.
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fluorinating agents
They are powerful ________ and are hydrolyzed readily even in small traces of water.
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Radon
________ is obtained in a radioactive decay.
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Compounds of radon
________ have not been isolated but only identified (e.g., RnF2) by radiotracer technique.
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Liquid helium
________ is used as cryogenic agent for carrying out various experiments at low temperatures.
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volatile liquid
XeOF4 is a colorless ________ and has a square pyramidal molecular structure.
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modern diving
It is used as a diluent for oxygen in ________ apparatus because of its very low solubility in blood.
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noble gases
Since ________ have stable electronic configuration they have no tendency to accept an electron so they have high positive electron gain enthalpy.
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Helium
________ has the lowest boiling point (4.2 K) of any known substance.
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noble gases
All ________ except Radon are found in the atmosphere.
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Helium
________ and Neon are also found in radioactive minerals.
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noble gases
In general, ________ are least reactive.
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Group 18 consists of six elements
helium, neon, argon, krypton, xenon and radon
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Order of Atomic radii
Xe> Kr> Ar> Ne> He
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Order of Ionization enthalpy
He> Ne> Ar> Kr> Xe> Rn
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Order of electron gain enthalpy
Ne> Ar=Kr> Xe> Rn> He
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He attempted to make the same type of compound using Xe and was successful in making another red color compound Xe+ PtF6
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Flashcard (29)