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**1. Homework Statement**

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. Homework Equations**

**3. The Attempt at a Solution**

No clue.