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The following are hypothetical configurations for a chlorine atom.
1. 1s22s22p63s33p4
2. 1s22s22p63s23p5
3. 1s22s22p63s13p6
4. 1s22s22p73s23p4
5. 1s22s32p63s23p4
6. 1s22s22p63s22d7
Which use nonexistent orbitals? Select all possible answers.
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