Which one of the following is the electronic configuration of an element with a maximum oxidation state of +5?
- 1s² 2s² 2p⁵
- 1s² 2s² 2p⁶ 3s² 3p¹
- 1s² 2s² 2p⁶ 3s² 3p³
- 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁷ 4s²
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