Which of the following ions has a stable octet? (2023)

Which of the following ions has a stable octet? (2023)

Step 1: Understand what a stable octet means. A stable octet refers to having eight electrons in the outer shell of an atom, which makes it stable.
Step 2: Identify the ions given in the question: Na+ (sodium ion), Cl- (chloride ion), and Mg2+ (magnesium ion).
Step 3: Determine the electron configuration of each ion: Na+ has lost one electron, Cl- has gained one electron, and Mg2+ has lost two electrons.
Step 4: Check the electron configurations: Na+ has 10 electrons (stable octet), Cl- has 18 electrons (stable octet), and Mg2+ has 10 electrons (stable octet).
Step 5: Conclude that all three ions (Na+, Cl-, and Mg2+) have achieved a stable octet configuration.

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