| 21. | Noble gases, caesium and iodine were absent, signifying their volatilization from the hot material.
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| 22. | The noble gases up to xenon have multiple stable isotopes.
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| 23. | Like the other noble gases, krypton is highly chemically unreactive.
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| 24. | For example, unreactive gases ( e . g . noble gases ) formed one column.
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| 25. | Many tiny cells between two panels of glass hold an inert mixture of noble gases.
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| 26. | The lighter noble gases ( helium through argon ) do not form stable binary fluorides.
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| 27. | The heavier noble gases ( krypton, xenon ) are the rarest stable elements on Earth.
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| 28. | The noble gases have full valence electron shells.
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| 29. | The inertness of noble gases makes them very suitable in applications where reactions are not wanted.
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| 30. | His doctoral thesis dealt with the effects of Zeeman effect on spectral lines of noble gases.
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