Among the listed elements, which has the highest electron affinity? I know the answer to number 1 is Cl and answer to the number 2 is F, but I want a detailed explanation/approach for how to get the answer. 1. a.) Sn b.) Si c.) K d.) Cl e.) Sr f.) Ar 2.   a.) F b.) Si c.) K d.) N e.) S f.) He Solution In the periodic table, electron affinity decreases from top to bottom and electron affinity increases from left to right. But exception is incase of Cl and F. Due to smaller size of F in compare to Cl, electron-electron repulsion occurs. 1) Cl have the highest electron affinity because the electronegativity of Cl is high and comparatively larger size. Cl have higher electron affinity. 2) electron negativity of F is highest and hence electron affinity is highest among the option elements. .

1. Among the listed elements, which has the highest electron affinity? I know the answer to number
1 is Cl and answer to the number 2 is F, but I want a detailed explanation/approach for how to
get the answer.
1. a.) Sn b.) Si c.) K d.) Cl e.) Sr f.) Ar
2. Â Â a.) F b.) Si c.) K d.) N e.) S f.) He
Solution
In the periodic table, electron affinity decreases from top to bottom and electron affinity
increases from left to right.
But exception is incase of Cl and F.
Due to smaller size of F in compare to Cl, electron-electron repulsion occurs.
1) Cl have the highest electron affinity because the electronegativity of Cl is high and
comparatively larger size.
Cl have higher electron affinity.
2) electron negativity of F is highest and hence electron affinity is highest among the option
elements.