Iodine and potassium form an ionic bond. Iodine has seven electrons in its outer shell, and potassium has one electron in its outer shell. Which conclusion is best supported by this information?

Iodine has seven electrons in its outer shell, so it can gain one electron to fill that shell. Gaining one negatively charged electron gives iodine a 1− charge, making “Iodine becomes an ion with a negative 1 charge” the best-supported conclusion. Potassium tends to lose its one outer electron and become +1, not +7.

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