find out valency of the atoms represented by figure
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the one with two rings have valency (8-7) =1 and other has (8-8)= 0 valency
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(a) no. of electron=18
i.e (2,8,8)...electronic configuration
valency=0...argon
(b) no.of electron =9
i.e (2,7)....electronic configuration
valency=1...flourine
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