(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

The ground state electron configuration for phosphorus, which has 15 electrons, is

- 1s^2 2s^2 2p^6 3s^1 3p^4
- 1s^2 2s^2 2p^6 3s^2 3p^3
- 1s^2 2s^2 2p^6 3s^2 3d^3
- 1s^2 2s^2 2p^6 3s^1 3d^4
- 1s^2 2s^2 2p^6 3p^2 3d^3

2. Relevant equations

3. The attempt at a solution

No clue.

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# Homework Help: GRE question - atomic physics

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