Elements of group 1 and 17 both have valency 1
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1 is hydrogen and 17 is chlorine valency is 1
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ya they have but ;
elements of 1st group have positive (basic radicals ) and and of 17th group have negative(acidic redicals).
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elements of 1st group have positive (basic radicals ) and and of 17th group have negative(acidic redicals).
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