| 21. | Fluorine can occur naturally in some areas in ground water.
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| 22. | The repair involves lubricating the switch assembly with a special fluorine grease.
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| 23. | Fluorine and chlorine are more electrophilic and are more aggressive halogenating agents.
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| 24. | FDG is a complex of radioactive fluorine that is tagged with glucose.
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| 25. | It is made of carbon, hydrogen, and fluorine.
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| 26. | Difluoroalkenes are alkenes that have two fluorines on their sp 2 carbon.
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| 27. | This is a relatively lower cost and fluorine free synthesis.
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| 28. | Older bones have more fluorine and uranium and less nitrogen.
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| 29. | Cadmium fluoride has also been prepared by reacting fluorine with cadmium sulfide.
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| 30. | The bond between the carbon and fluorine atoms is covalent.
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