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.
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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