Problem: Rank the following elements by electron affinity, from most positive to most negative EA value. Rank from most positive to most negative. To rank items as equivalent, overlap them.brominesodiumtelluriumheliumphosphorus

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We’re being asked to determine the halogen with the lowest 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. 


From top to bottom, the halogens are:


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Problem Details

Rank the following elements by electron affinity, from most positive to most negative EA value. Rank from most positive to most negative. To rank items as equivalent, overlap them.

bromine

sodium

tellurium

helium

phosphorus

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