Question:
Which of the following elements does not have a completely filled outermost shell in its ground state?
Which of the following elements does not have a completely filled outermost shell in its ground state?
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Noble gases like He, Ne, and Ar have completely filled valence shells. Elements like oxygen do not, making them more chemically reactive.
Updated On: Apr 21, 2025
- Neon
- Helium
- Oxygen
- Argon
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The Correct Option is C
Solution and Explanation
Neon, Helium, and Argon are noble gases with completely filled outermost electron shells in their ground states. Oxygen, on the other hand, has the electron configuration \(1s^2\,2s^2\,2p^4\), meaning it has only 6 electrons in its outermost shell (which can hold up to 8). Thus, it does not have a completely filled outer shell.
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