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Within each pair of elements of F & Cl , S & Se, and Li & Na, respectively, the elements that release more energy upon an electron gain are- (1) F, Se and Na (2) F, S and Li (3) Cl, S and Li (4) Cl, Se and Na |
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Answer» Answer is (3) Cl, S and Li (i) Electron affinity of second period p-block element is less than third period p-block element due to small size of second period p-block element. E.A. order : F < Cl (ii) Down the group electron affinity decreases due to size increases. EA. order : S > Se Li > Na Answer is (3) Cl, S and Li |
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