| 11. | They are isoelectronic, but fluoride is bigger because its nuclear charge is lower.
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| 12. | This ion is isoelectronic with the hydrogen molecule.
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| 13. | Further catenation is rare, although ( isoelectronic with carbonate and nitrate ) is known.
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| 14. | The "'tetrafluoroammonium "'isoelectronic with tetrafluoromethane and the tetrafluoroborate anion.
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| 15. | It is isoelectronic with N 2.
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| 16. | BF is isoelectronic with carbon monoxide ( CO ) and so could form similar compounds to metal carbonyls.
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| 17. | With fluoride, PF 5 forms PF 6 ", an anion that is isoelectronic with SF 6.
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| 18. | The tetramethylborate ion has a negative charge and is isoelectronic with neopentane, tetramethylsilane, and the tetramethylammonium cation.
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| 19. | It is isoelectronic with a chlorine " atom ", also undergoing pairing to form Cl 2 molecules.
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| 20. | Has a number of canonical resonance forms making it isoelectronic with bisulfite ion,, which has a similar structure.
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