Chemistry Practice Problems Periodic Trends: Electron Affinity Practice Problems Solution: Of the following elements, __________ has the most...

Solution: Of the following elements, __________ has the most negative electron affinity.A) SB) ClC) SeD) BrE) I

Problem

Of the following elements, __________ has the most negative electron affinity.

A) S

B) Cl

C) Se

D) Br

E) I

Solution

We’re being asked to determine the element with the highest (most negative) electron affinity


Recall that electron affinity is the energy change from the addition of 1 e to a gaseous element/ion


It is represented by this chemical equation:

Atom(g) + e  Ion(g), ΔE = –E.A. 


The trend for electron affinity is as follows: it increases from left to right and decreases down a period in the periodic table. 

The given elements are:

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