Which of the following elements is the most likely to gain electrons to become an anion?

Question

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Iodine (I) is in group 17 of the periodic table, which means it has 7 valence electrons and is only one electron away from having a full outer shell of 8 electrons. Thus, it is more likely to gain one electron and become an anion (I-) to achieve stability. Ar (Argon) is already a noble gas with a full outer shell, and Mg (Magnesium) is in group 2, meaning it has 2 valence electrons and will lose electrons to achieve a full outer shell, making it less likely to become an anion. C (Carbon) is in group 14 and requires 4 more electrons to fill its outer shell, making it more likely to form covalent bonds rather than gain electrons to form an anion.

Which of the Following Elements Is the Most Likely to Gain