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Consider the first (Ei1) and second (Ei2) standard enthalpy of ionization values for K and Ca...

Consider the first (Ei1) and second (Ei2) standard enthalpy of ionization values
for K and Ca given in Table 2E.2 in the textbook. Why is Ei2/ Ei1 so much larger
for K (≈ 7) than for Ca (≈ 2)?
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