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, so the supported conclusion is that iodine becomes an ion with a negative 1 charge. Potassium loses its one outer electron and becomes 1+, not 7+.

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