Easy
Which of the following represents the electronic configuration of an element with atomic number $17$?
- A$1s^2, 2s^2 2p^6, 3s^1 3p^6$
- B$1s^2, 2s^2 2p^6, 3s^2 3p^4, 4s^1$
- C$1s^2, 2s^2 2p^6, 3s^2 3p^5$
- D$1s^2, 2s^2 2p^6, 3s^1 3p^4, 4s^2$
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