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At. no of silicon=14
elec. conf.=2,8,4
at. no. of chlorine=17
elec. conf.=2,8,7
valency=1(it gains 1 electron)
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No of Si=14
elec.conf=2,8,4. so, valency=4
no of Cl =17
elec.conf=2,8,7 so,valency=1 because it gains 1e-

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