Answer:
Ba+
Explanation:
We must use the group of each of these ions to determine their ionic charge(image attached below). We will compare the charge given to what it should be based on group number to determine which is given incorrectly.
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- F- : Fluorine is in group 17, which means it typically gains one electron to fill its outer electron shell to become the fluoride ion (F-). ✅
- Mg2+: Magnesium is in group 2 which means it typically loses two electrons to achieve a full outer shell and becomes the magnesium ion (Mg2+). ✅
- Ba+: Barium is in group 2, it typically loses two electrons to achieve a full outer shell. Therefore, Ba2+ is correct, not Ba+. ❌
- Se2-: Selenium is in group 16 which means it typically gains two electrons to achieve a full outer shell and becomes the selenide ion (Se2-). ✅
- N3- : Nitrogen is in group 15, so it typically gains three electrons to achieve a full outer shell and becomes the nitride ion (N3-).
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Therefore, Ba+ should instead be Ba2+ making that the incorrect option.
