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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