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10 September, 21:54

When comparing the two elements k and cs, the element with the more negative electron affinity is?

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  1. 10 September, 22:05
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    The answer to this question would be: cs

    Electron affinity is determined by the amount of energy released/spent for the atom to add an electron for neutral atoms in gas state.

    Lower periodic table means a bigger radius atom. In this case, the distance between the electron to the nucleus is further too, so the affinity is expected to become lower.

    In this question, the K and Cs are located in the first column of the periodic table, but Cs located lower. So, the Cs that located lower in periodic table should have a lower affinity.
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