Maximum value (n + l + m) for unpaired electrons in second excited state of chlorine 17cl is
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The electronic configuration of chlorine (atomic no 17) is
1S2 2S2 2P6 3S2 3P7
max value of principle quantum no is 3
Max value of azimuthal quantum no is 1
Max value of magnetic quantum no is 1
Max value of (n+l+m)=(3+1+1)=5
The valency of this element is 1.It is P block element. It belongs in group 17 in modern periodic table.
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