Easy
Which one of the following electronic configurations represents a noble gas?
- A$1s^2, 2s^2 2p^6, 3s^2$
- B$1s^2, 2s^2 2p^6, 3s^1$
- C$1s^2, 2s^2 2p^6$
- D$1s^2, 2s^2 2p^6, 3s^2 3p^6, 4s^2$
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