Problem: Which equation correctly represents the first electron affinity (EA 1) of calcium?a. Ca(g) + e–  →  Ca–(g)b. Ca(g) →  Ca+(g) + e–c. Ca+(g) + e– → Ca(g)d. Ca(g) →  Ca–(g) + e–e. Ca–(g) → Ca(g) + e–

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We’re being asked to determine the equation representing the first electron affinity of Ca

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. 

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Problem Details

Which equation correctly represents the first electron affinity (EA 1) of calcium?

a. Ca(g) + e  →  Ca(g)

b. Ca(g) →  Ca+(g) + e

c. Ca+(g) + e– → Ca(g)

d. Ca(g) →  Ca(g) + e

e. Ca(g) → Ca(g) + e

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