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a) 9 because it refers to the same group
b) 9 which is florin which is the highest electronegative element
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good morning here is your answer!
Explanation:
a)florine(atomic no. 9)
valency of florine and chlorine is 1 as they are in the same group i.e the halogen group(17) also both are electronegative in nature.
b)florine(atomic no. 9)
Fluorine is more electronegative than chlorine because fluorine is smaller and has its electrons closer to the positively charged nucleus.
hope it helps you
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