plz tell correct answer with correct numbering plz.
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B) 1s2 2s2 2p6 3s2 3p5
I) 17 group (halogens)
II) 7 e-
IlI) valancy = -1
IV) It's a non metal
V) Number of protons =17 and Number of neutrons= 35-17=18
Explanation:
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