How will you find the valency of chlorine Sulphur and magnesium, if their atomic numbers are 17,16 and 12 respectively.
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di the electronic configuration for clorine last 2 digits you will get answer
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I think it depends on electronic configuration in which group it belongs
metal or non metal as for sulphur it have ec -2,8,6 so it need 2electron to be stable also it shows variable valency,cl valency is 1-,for magnesium valency is 2,as ec -2,8,2
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