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  • General Chemistry Fundamentals
  • Which of the following configurations is not possible?
Multiple choice

Which of the following configurations is not possible?

  1. 1s2 2s2 2p7

  2. 1s2 2s2 sp6

  3. 1s2 2s2 2p5

  4. 1s2 2s2

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The p-subshell can hold maximum 6 electrons (Pauli exclusion principle: 3 orbitals × 2 electrons). Option A shows 2p^7 which is impossible. Option B has a typo but 2p^6 is valid.

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