| 21. | "' Noble gas configuration "'is the term given to the electron configuration of noble gases.
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| 22. | A colorless, heavy, odorless noble gas, xenon occurs in the Earth's atmosphere in trace amounts.
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| 23. | Calculations indicate that radon difluoride may be ionic, unlike all other binary noble gas fluorides.
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| 24. | Xenon compounds are the most numerous of the noble gas compounds that have been formed.
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| 25. | In his doctoral thesis he described the noble gas filled thermionic converter developed by him.
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| 26. | High-order harmonic generation has been observed in noble gas jets, cells, and gas-filled capillary waveguides.
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| 27. | Argon is the most abundant noble gas in Earth's crust, comprising 0.00015 % of the crust.
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| 28. | The light emission of highly compressed noble gas is exploited technologically in the argon flash devices.
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| 29. | "' Noble gas compounds "'are chemical compounds that include an group 18 of the periodic table.
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| 30. | Also mention the history of noble gas compounds.
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