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1 2 s. CL 1s2 2s2 2p6 3s2 3p5. F1/f2 s1/s2. F 1s2 2s2. CL 1s2 2s2.
CL 1s2 2s2 2p6 3s2 3p5. F1/f2 s1/s2. F 1s2 2s2. CL 1s2 2s2.

See also