Question 1
The ground state configuration of chlorine (Z = 17) is
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1s2 2s2 2p5 3s2 3p6
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1s2 2s2 2p6 3s2 3p5
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1s2 2s2 2p6 3s2 3p4 3d1
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1s2 2s2 2p6 3s2 3p5 4s1
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1s2 2s2 2p6 3s1 3p7
Question 2
The K, L, M symbols represent values of the quantum number
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n
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ms
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mj