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The average distance between the oxygens in the crown ether ring is 5.74 Angstroms. Which metal...

The average distance between the oxygens in the crown ether ring is 5.74 Angstroms. Which metal ion would most likely fit well into my molecule: Li+ =1.20 Angstroms, Na+=1.80 Angstroms, or K+=2.66 Angstroms, and explain why.

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